Comsol Multiphysics 35a Free !new! New Download May 2026

Searching for "COMSOL Multiphysics 3.5a free new download" typically refers to an older, legacy version of the software (released circa 2008). While unofficial sites may claim to offer "free" or "new" downloads of this version, COMSOL Multiphysics is proprietary, paid software. Obtaining it through unofficial channels poses significant security risks and violates licensing agreements. Safe & Official Ways to Get COMSOL

The most reliable method to access the software is through the official COMSOL Product Download page. The COMSOL® Software Product Suite Latest Release: COMSOL Multiphysics® Version 6.4.

Comsol | UConn Software Catalog | Information Technology Services

Overview

• COMSOL Multiphysics 3.5a is a powerful software for modeling and simulating various physical phenomena, such as heat transfer, fluid dynamics, and structural mechanics.
• The software is widely used in various fields, including engineering, physics, and chemistry.

Key Features

• Multiphysics simulations: COMSOL Multiphysics 3.5a allows users to model and simulate multiple physical phenomena simultaneously, enabling a more comprehensive understanding of complex systems.
• User-friendly interface: The software features an intuitive and user-friendly interface that makes it easy to set up and run simulations.
• Advanced meshing tools: COMSOL Multiphysics 3.5a offers advanced meshing tools that enable users to create high-quality meshes for complex geometries.
• Powerful solvers: The software includes powerful solvers that can handle large and complex models, enabling users to simulate a wide range of applications.

Benefits

• Improved product design: COMSOL Multiphysics 3.5a enables users to simulate and optimize product performance, reducing the need for physical prototypes and improving product design.
• Increased efficiency: The software streamlines the simulation process, allowing users to quickly and easily model and analyze complex systems.
• Enhanced collaboration: COMSOL Multiphysics 3.5a facilitates collaboration among researchers and engineers by providing a common platform for simulation and analysis.

System Requirements

• Operating System: Windows XP/Vista/7/8/10 (32-bit or 64-bit)
• Processor: Intel Pentium IV or equivalent (2 GHz or faster)
• Memory: 2 GB RAM (4 GB or more recommended)
• Disk Space: 2 GB free disk space (more required for large models)

Download Information

• File Size: approximately 500 MB (depending on the installation package)
• File Type: executable file (.exe) or zip file (depending on the installation package)
• Download Link: [insert download link or provide instructions on how to download]

Additional Information

• Free trial: COMSOL Multiphysics 3.5a is available as a free trial, allowing users to test the software before purchasing.
• Educational licenses: Educational licenses are available for students, teachers, and researchers, providing access to the software at a discounted rate.
• Support: COMSOL provides extensive support resources, including documentation, tutorials, and customer support.

Warning

• Caution: Be aware of potential risks when downloading software from third-party sources, such as viruses or malware. Ensure that the download link is reputable and scan the file for viruses before installation.

Alternatives

• ANSYS: A commercial software package for simulating and analyzing various physical phenomena.
• OpenFOAM: An open-source software package for simulating fluid dynamics and heat transfer.
• COMSOL Multiphysics alternatives: Other alternatives to COMSOL Multiphysics include Abaqus, Autodesk Simulation, and Lumerical.

My recommendation:

If you want to use COMSOL:

• Get the free trial from comsol.com (no credit card needed for the 30-day trial usually).
• If you're a student, check if your university has a campus license.
• If you need a perpetual free alternative, look at OpenFOAM (CFD), Elmer FEM (multiphysics), or FEniCS (programmatic FEM).

If you need to open an old 3.5a model file:

• COMSOL no longer supports direct conversion from 3.5a to current versions. You would need to rebuild the model manually.

Bottom line: Don't search for "COMSOL 3.5a free new download." It's a trap for malware, not a solid solution. Go for the official trial of the latest version instead.

COMSOL Multiphysics 3.5a is a legacy version of the simulation platform originally released on November 3, 2008. While it was a groundbreaking update for its time, it is important to note that COMSOL is paid commercial software and does not offer a permanent "free download" for this or newer versions.  Understanding COMSOL Multiphysics 3.5a 

Version 3.5a introduced significant improvements in simulation efficiency and CAD interoperability. Key highlights included: 

Performance Boosts: Implementation of new solvers, such as the time-dependent segregated solver, which could cut memory usage by up to 50% for complex simulations like Joule heating.

CAD Interoperability: Support for the Parasolid file format, allowing for better integration with third-party engineering applications.

Module Advancements: Updates to the Earth Science Module for groundwater modeling and the introduction of new bidirectional interfaces for software like Autodesk Inventor.  How to Legally Obtain COMSOL 

Genuine copies of COMSOL Multiphysics must be obtained through official channels: 

Trial Licenses: You can request a fully functional 1-month evaluation copy from a local distributor or via the COMSOL website.

Academic & Student Access: Many universities hold Class Kit licenses, allowing students to use the software for educational, non-research purposes.

Modern Versions: The current version is 6.4 (released November 2025). It includes modern features like the Model Manager and Application Builder that were not available in the 3.5a era.  Historical System Requirements for 3.5a 

For those running legacy hardware, 3.5a was designed for the following environments: 

Dr. Aris Thorne stared at his screen, his modern FEA software screaming "License Error" for the third time this week. It was 2026, and his university, facing drastic budget cuts, had restricted access to the latest CAD-integrated simulation tools. Meanwhile, Aris was against a deadline to validate a 15-year-old sensor design—a micro-cantilever beam with delicate electrostatic actuation and squeezed-film damping—using old data sets that the new software refused to import properly. He needed something that could handle complex, coupled physics without checking in with a license server every five minutes. The Discovery:

While clearing out old backups, he stumbled upon an old, dusty hard drive from his mentor. Amidst the data was an ISO file: COMSOL_Multiphysics_3.5a.iso

. He remembered this version. It was released around 2008-2009—renowned for being the "most efficient COMSOL ever" in its time. It was stable, robust, and fast, often 3x faster for large flow models than its predecessors. The "New" Installation:

Aris didn't need the modern 6.x features; he needed the speed and dependability of the past. He mounted the ISO, initiating the installation. The interface was nostalgic, yet remarkably clean. He quickly imported his Parasolid file directly, utilizing the 3.5a CAD Import Module, which was known for its seamless handling of CAD geometry without needing to convert it first. The Solution:

Within an hour, Aris had set up his model: 3D Structural Mechanics, Electrostatics, and Deformed Mesh (ALE) all coupled together. He ran the new time-dependent segregated solver, which, true to its reputation, reduced memory usage by up to 50% for Joule heating simulations.

He clicked "Solve." Instead of crashing, the plot appeared, refreshing in real-time. He watched the micro-cantilever bend, the electrostatic force battling the structural stiffness. The Victory:

The simulation completed faster than he expected. The results aligned perfectly with his 2010 research paper, validating the sensor's behavior exactly as intended. Aris leaned back, smiling. Sometimes, the "new" solution is actually a reliable, free, and efficient blast from the past. Why COMSOL 3.5a? (Based on 2008/2009 context)

Implemented new solvers, making it substantially faster for time-dependent structural mechanics and fluid-flow simulations. CAD Interoperability:

Strong support for Parasolid file format and bidirectional interfaces. Stability:

Often cited in technical papers from that era for its reliability in academic and research settings (e.g.,). Memory Efficiency:

New solvers allowed larger problems to run on 32-bit and 64-bit computers.

Note: As shown in and, official, safe downloads for COMSOL are available through the COMSOL website via a trial license or subscription. COMSOL 3.5 comsol multiphysics 35a free new download

* COMSOL Multiphysics® 3.5 Advances Simulation Efficiency and Productivity through High-Performance CAD and ECAD Interoperability. www.comsol.jp

COMSOL Multiphysics is a premier finite element analysis (FEA) software suite used for simulating physics-based designs and processes across various engineering disciplines. Released around 2008, Version 3.5a was a significant milestone that introduced improved meshers and expanded solvers, though it has since been superseded by many major releases, with Version 6.4 being the latest as of 2026. Downloading COMSOL Multiphysics 3.5a

Official distribution of legacy versions like 3.5a is strictly controlled by COMSOL to ensure security and license compliance.

Official Channel: Authorized users with an active COMSOL Access account can typically download installers for their licensed versions directly from the COMSOL Product Download page.

Acquisition: COMSOL Multiphysics is proprietary software; a valid license file is mandatory for both the download and installation process.

Free Options: While the full suite is paid, COMSOL offers a free COMSOL Client for Windows to run pre-built applications. Students and faculty can often access the software for free or at reduced rates through university site licenses. Core Capabilities and Multiphysics Approach

The hallmark of COMSOL is its unified workflow that allows users to couple any number of physical phenomena together.

COMSOL Multiphysics® Software - Understand, Predict, and Optimize

It sounds like you’re looking for a way to get your hands on COMSOL Multiphysics 3.5a, likely for research, legacy project compatibility, or learning purposes.

While it's tempting to search for "free download" links, there are some important things you should know about this specific version and how to access COMSOL safely today. What was COMSOL Multiphysics 3.5a?

Released back in 2008, version 3.5a was a landmark for the software. It was one of the last versions to feature the "classic" interface before COMSOL transitioned to the modern Model Builder environment in version 4.0. It was prized for its efficiency in fluid dynamics (CFD), structural mechanics, and electromagnetics. The Truth About "Free New Downloads"

If you find a website offering a "free new download" of version 3.5a today, you should proceed with extreme caution for a few reasons:

Security Risks: Cracked or "free" versions of high-end engineering software often come bundled with malware, spyware, or keyloggers that can compromise your computer.

Compatibility Issues: Version 3.5a was designed for Windows XP and Vista. Running it on Windows 10 or 11 is notoriously difficult and often requires complex virtual machines or specific legacy drivers that are hard to find.

Lack of Support: Legacy versions don't receive security patches or bug fixes, meaning your simulations might produce errors that you can't troubleshoot. How to Get COMSOL Legally (and for Free)

Instead of risking a shady download, here are the legitimate ways to access COMSOL:

Trial Licenses: If you are a student or professional, you can request a free trial license directly from COMSOL. This usually gives you the latest version (e.g., 6.2), which is significantly more powerful and easier to use than 3.5a.

Academic Access: Most universities have a site license. Check with your IT department or engineering lab; you might already have access to the latest version for free.

COMSOL Class Kit: Educators can often get limited-time licenses for classroom use, allowing students to learn the software without a personal purchase. Why You Should Use the Latest Version Instead

While 3.5a was great for its time, the newer versions offer:

The Application Builder: Turn your models into easy-to-use apps.

Better Solvers: Simulations that took hours in 3.5a now take minutes.

Cloud Computing: The ability to run massive simulations on external servers.

Summary: While you might be looking for version 3.5a for a specific old project, it is highly recommended to use a trial of the latest version through official channels to ensure your data and hardware stay secure.

Are you trying to open an old .mph file from a previous project, or are you just looking for a low-spec version of the software to run on an older laptop?

As of April 2026, COMSOL Multiphysics® version 6.4 is the current, state-of-the-art release. While older versions like 5.3a are listed in legacy download archives, they do not contain the modern, enhanced simulation features.

For free access, you cannot officially download a free "full" version, but you can request a 14-day free trial. How to Get a Free 14-Day Trial (2026)

Visit the Trial Page: Go to the official Humusoft trial registration or the COMSOL contact page to request a trial.

Access Account: Create a COMSOL Access account to access the installer.

Use Official Installer: The trial includes full functionality and all modules for 14 days. Detailed Features (Latest 2026 Context)

The latest version (6.4+) emphasizes high-performance multiphysics simulations, including the following key areas:

Multiphysics Coupling: Seamlessly couple electrical, mechanical, fluid flow, chemical, and acoustic phenomena (e.g., thermal-structural, piezo-electric, fluid-structure interaction).

Model Manager: A robust workspace for managing simulation models, apps, and data, enhancing collaboration and version control.

Application Builder: Allows users to turn complex models into user-friendly simulation apps (with customized UIs) using the Application Builder and COMSOL Server™.

Geometry & Mesh: Comprehensive geometry engine with CAD import capabilities (SolidWorks, AutoCAD, etc.) and automatic/manual meshing tools. Searching for "COMSOL Multiphysics 3

Performance: Enhanced solvers for faster, more accurate solutions in 3D CFD and electromagnetic analyses.

Material Library: Built-in and custom material creation capabilities. Key Differences in Older 5.3a

If you are specifically seeking version 5.3a, you are likely looking for:

Performance Stability: It was a well-regarded stable release, though it lacks the modernized UI and faster solvers of 6.x.

Language Support: Similar support for Python-based API and CAD import, but with fewer built-in "app" examples. To make sure you get the right tool, let me know:

What specific, coupled, or complex physics are you trying to simulate (e.g., heat + flow, structure + elec)?

Are you looking to use this for academic research, professional engineering, or learning? I can then tell you which add-on modules you'll need. COMSOL - Software for Multiphysics Simulation

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The query "COMSOL Multiphysics 3.5a free new download" refers to an outdated version of a professional simulation software suite that is not legally available for free download. 0;16; 0;92;0;a3; 0;baf;0;65e; Critical Information on COMSOL Multiphysics 3.5a 0;16;

COMSOL Multiphysics is a proprietary software used for modeling and simulating physics-based systems. Version 3.5a was released around 2008 and has long since been superseded by more modern versions (currently in the 6.x series). 0;16; 0;52f;0;8c4;

Licensing: COMSOL is paid commercial software. There is no "free" version of 3.5a or current versions available for public download without a valid license from COMSOL AB. 0;8c3;

Security Risks: Websites claiming to offer "free new downloads" of older COMSOL versions often distribute cracked or pirated software. Downloading these files poses significant security risks, including malware, ransomware, and data theft. 0;7ef;

Compatibility: Version 3.5a was designed for operating systems like Windows XP or Vista. It is unlikely to run natively or stably on modern systems like Windows 10 or 11. 0;2a; Legal and Safe Alternatives 0;16;

If you are looking to use COMSOL Multiphysics for educational or professional purposes, consider these legitimate paths: 0;16;

Free Trial: You can request a free trial of the latest version directly from COMSOL to test its capabilities. 0;7e9;

Academic Licensing: If you are a student or researcher, your university likely provides access through a site license or offers heavily discounted student versions. 0;40c;

Open Source Alternatives: For physics simulation without the cost, consider open-source tools like: FreeCAD0;958; (for general modeling) OpenFOAM (for fluid dynamics) ELMER (for multiphysics) 0;54;

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I can’t help with requests to find or provide free downloads of commercial software or to assist in obtaining licensed software illegally.

If you’d like, I can instead:

• Summarize COMSOL Multiphysics 5.3a features and typical uses;
• Explain licensing options and how to obtain it legitimately (trial, academic, student, or commercial licenses);
• Recommend free/open-source alternatives (e.g., FreeFEM, OpenFOAM, Elmer) with brief comparisons and where to get them;
• Provide a step-by-step guide to install a legitimate trial or student edition.

Which of those would you like?

The phrase "COMSOL Multiphysics 3.5a free new download" represents a intersection of legacy engineering software and the persistent risks associated with seeking unlicensed technical tools online. While COMSOL Multiphysics is currently a titan in the simulation industry, version 3.5a dates back to the late 2000s, marking a specific era in the evolution of Finite Element Analysis (FEA). The Legacy of Version 3.5a

Released around 2008, COMSOL 3.5a was a pivotal update that introduced enhanced solvers and expanded capabilities in electromagnetics, structural mechanics, and fluid flow. For many veteran engineers, this version is remembered for its classic interface before the software transitioned to a more modern, ribbon-based GUI. In academic and niche industrial circles, some users still seek this specific version to run legacy models or because it requires significantly fewer hardware resources than the modern, computationally heavy versions. The Risks of "Free" Downloads

The search for a "free download" of such specialized software almost exclusively leads to "abandonware" sites, torrents, or unofficial repositories. These sources pose three primary risks: Cybersecurity Threats:

Installers for cracked engineering software are notorious breeding grounds for malware, ransomware, and credential-stealing Trojans. Because these tools require deep system permissions to bypass licensing checks, they provide a backdoor for malicious code. Lack of Stability and Support:

Legacy software often struggles with modern operating systems like Windows 10 or 11. Without official patches, users frequently encounter "DLL" errors, driver incompatibilities, and sudden crashes that can corrupt hours of simulation work. Legal and Ethical Implications:

Using unlicensed software violates Intellectual Property (IP) laws. For professionals, this can result in severe corporate audits and legal penalties; for students, it can lead to academic disciplinary action. Modern Alternatives

For those seeking the power of COMSOL without the risks of illicit downloads, several legitimate paths exist: Academic Licensing:

Most universities provide heavily subsidized or free access to the latest version of COMSOL for students and researchers. Trial Licenses: COMSOL Multiphysics 3

COMSOL provides time-limited trial licenses through their official sales representatives for evaluation purposes. Open-Source FEA: Tools like

offer robust multiphysics capabilities entirely for free, providing a legal and secure alternative for hobbyists and independent researchers.

In conclusion, while the nostalgia or specific requirements for COMSOL 3.5a are understandable, the dangers of seeking a "free new download" far outweigh the benefits. Relying on modern, legitimate software ensures not only the integrity of the simulation results but also the security of the user’s digital environment. to COMSOL or learn how to request an official trial license for the current version?

Title: Navigating Software Acquisition: An Analysis of "COMSOL Multiphysics 35a" and the Risks of Illicit Downloading

Abstract This paper addresses the frequent online search query regarding "COMSOL Multiphysics 35a free new download." It examines the version nomenclature of COMSOL software, highlighting that version "35a" does not exist within the official release history. The paper further explores the significant risks associated with seeking "free" downloads of proprietary engineering software, including security vulnerabilities, legal liabilities, and academic integrity violations. Finally, it outlines the legitimate channels for obtaining COMSOL Multiphysics, including trial versions and academic licensing.

1. Introduction COMSOL Multiphysics is a finite element analysis, solver, and simulation software package for various physics and engineering applications. Due to its high cost and industry-standard status, there is a persistent demand for free or cracked versions of the software on the internet. A specific search term of interest is "COMSOL Multiphysics 35a free new download." This query suggests a misunderstanding of the software’s release cycle and exposes the user to a high risk of malware and legal action. This paper aims to deconstruct this search trend and provide a factual basis for software acquisition.

2. Analysis of Version Nomenclature The first critical issue to address is the version number itself: "35a."

Historically, COMSOL has utilized a specific versioning system. Early versions were numbered sequentially (e.g., 3.5, 4.0, 4.3a, 5.0). In recent years, COMSOL introduced a new versioning format aligned with the year of release.

• The "3.5" Confusion: COMSOL version 3.5 was a seminal release (circa 2008), which was eventually followed by 3.5a. It is possible that "35a" is a typo for "3.5a" (a legacy version) or "5.3a" (a more recent version).
• Current Naming Convention: As of the current date, COMSOL uses versions such as 5.6, 6.0, 6.1, etc. There is no official "35a" or "3.5a" release that would be considered "new."

Consequently, a search for "COMSOL 35a" is either searching for archaic software labeled incorrectly or, more likely, falling for a fabricated version name used by malicious actors to bait users.

3. The Risks of "Free" Downloads The pursuit of "free" downloads for premium proprietary software carries distinct and severe risks.

3.1. Security Vulnerabilities Software cracks, keygens, and unauthorized installers are prime vectors for malware distribution. Attackers often bundle trojans, ransomware, and spyware with high-demand engineering software like COMSOL. Because COMSOL is used in sophisticated R&D environments, a compromised installation can lead to:

• Theft of Intellectual Property (IP).
• Compromise of sensitive network credentials.
• Introduction of rootkits that persist even after the software is removed.

3.2. Lack of Functionality and Stability Illegitimate copies of simulation software are often unstable. In finite element analysis (FEA), the accuracy of the solver is paramount. Cracked software may have tampered DLL files that alter mathematical precision or cause solver failures, rendering scientific results unreliable and potentially dangerous in engineering applications.

3.3. Legal and Ethical Implications COMSOL is copyrighted software. Downloading or distributing cracked versions constitutes software piracy, which is illegal under international copyright laws. Institutions found using pirated software face hefty fines and reputational damage. For students, this can result in expulsion for violating academic integrity policies.

4. Official Alternatives and Solutions For users requiring access to COMSOL Multiphysics but unable to afford a commercial license, legitimate pathways exist:

4.1. Academic Licensing Many universities and research institutions hold floating network licenses for COMSOL. Students and faculty should consult their IT departments or engineering faculty to access these licenses, often available on campus machines or via VPN.

4.2. Official Free Trials COMSOL provides a fully functional evaluation version of the software. Users can apply for a trial license through the official COMSOL website. This allows for legitimate testing of the "new" features without legal or security risks.

4.3. COMSOL Access and Application Libraries While the software is paid, COMSOL provides "COMSOL Access," a free online platform where users can view documentation, participate in the user community, and access the Model Library to understand simulation techniques without needing the software open immediately.

5. Conclusion The search for "COMSOL Multiphysics 35a free new download" is based on a non-existent software version and exposes the user to unnecessary risks. Version "35a" is likely a fabrication or a typographical error for older versions like 3.5a or newer iterations like 5.3a. While the desire for accessible simulation tools is understandable, the use of cracked software compromises system security, data integrity, and legal standing. Users are strongly encouraged to utilize academic resources or official evaluation licenses to access the software safely and legitimately.

Disclaimer: This article is for informational and educational purposes only. COMSOL Multiphysics is a proprietary commercial software. "Free" typically refers to trial versions, student versions, or outdated legacy releases. Distributing cracked or pirated software is illegal and poses severe cybersecurity risks. This guide explains how to legally access the software at no cost.

Conclusion: Stop Searching, Start Simulating

The search for "COMSOL Multiphysics 35a free new download" is a quixotic quest. While version 3.5a holds a special place in simulation history, it is a security risk, lacks modern features, and is not legally free.

Your action plan:

1. Abandon the search for 3.5a cracks.
2. Go to the official COMSOL website and request the latest version 30-day trial.
3. If you are a student, ask your professor for a teaching license (free).
4. If you have zero budget, explore open-source alternatives like Elmer or OpenFOAM.

The world of multiphysics simulation is waiting for you. You don't need a relic from 2008. You need the power of 2024’s technology—legally, safely, and freely (at least for 30 days).

Have you tried to install an old legacy version of COMSOL? Share your experience in the comments below. For official downloads and pricing, always refer to comsol.com.

I can’t help find or link to pirated or unauthorized copies of commercial software. COMSOL Multiphysics 3.5a is proprietary and must be obtained through COMSOL or an authorized reseller.

Options I can help with:

• Steps to purchase or request a trial from COMSOL.
• How to check whether your institution has a license and how to access it.
• Help installing and licensing a legitimate copy you already have.
• Recommended free/open-source alternatives (e.g., FreeFEM, Elmer FEM, OpenFOAM) and brief comparisons.

Which of those would you like?

4. Archived Older Versions

If you have a valid license file for an older version (e.g., 3.5a from ~2009), you may download installers from your COMSOL account. Unlicensed use is still prohibited.

If you are specifically looking for a review of COMSOL 3.5a (for historical or academic reasons):

Here's a solid, objective review of what 3.5a was like back in its day — not a recommendation to download it now.

Pros (in 2008–2010 context):

• User interface: The pre-ribbon, classic COMSOL Desktop. Many long-time users felt 3.5a was the last "clean" UI before the big overhaul in v4.0 (2011). It had a model tree and a physics-controlled mesher, but less hand-holding.
• Scripting: Very strong MATLAB integration via Livelink™ for MATLAB. You could script almost everything.
• Stability: For the era, it was stable. Many academic papers from 2009–2012 cite 3.5a.
• Low system requirements: Could run on Windows XP, 32-bit, with 1–2 GB RAM.

Cons (major for today):

• No CAD import parity – Much weaker geometry handling than v5+.
• Meshing – Less robust than modern automatic meshing. Required more manual tweaking.
• Solver technology – Missing modern iterative solvers, preconditioners, and multiphysics couplings (e.g., some MEMS, plasma, or battery modules didn't exist yet).
• Postprocessing – Far less capable than current versions (no 3D cut planes with expression evaluation, limited animations).

Comparison to current COMSOL (6.x):
3.5a is like comparing a flip phone to a smartphone. You can make calls, but you miss 15+ years of UI, physics modules, solver speed, HPC support, and CAD interoperability.

The "Classic" Interface

Before the massive UI overhaul in COMSOL 4.0 (2011), version 3.5a featured a more "MATLAB-like" interface. Many veteran engineers argue that 3.5a was faster for script-based modeling and batch processing. It was lean, stable, and less resource-intensive than modern versions.

Alternatives to COMSOL (Free & Open-Source)

If you cannot afford COMSOL, consider these:

| Software | Best For | License | |----------|-----------|---------| | FreeCAD + FEM Workbench | Basic structural/thermal | LGPL | | OpenFOAM | Advanced CFD | GPL | | Elmer FEM | Multiphysics (heat, fluid, elasticity) | GPL | | FEATool Multiphysics (free version) | MATLAB-based FEM | Custom/Free | | CalculiX | Structural/thermal | GPL |

These lack COMSOL’s polish but can solve many identical problems legally.

Option C: The COMSOL File Archive (.mph files)

While not the software itself, COMSOL maintains a Model Exchange where users upload free .mph files. You can download these and open them in any demo version to see how simulations are built.