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...It features its own programming language, and many users have contributed useful packages in various areas over the decades. It is GPL-licensed and largely written in Common Lisp. Executables can be downloaded for Windows, Mac, Linux, and Android; sourcecode is also available. An active community maintains and extends the system.
Website: https://maxima.sourceforge.io
Additional add-on packages for Maxima can be found at: https://github.com/maxima-project-on-github/maxima-packages
JaxoDraw is a tool to generate Feynman diagrams in a mouse click-and-drag fashion. Graphs can be exported to a variety of graphics formats and arbitrary latex code can be used for labels to produce high-quality publishing-style figures.
...MathMod allows to plot 3D mathematical surfaces, described by implicit or parametric equations, and offers a very large database of model samples that can be generated with it. It's Free and Open Source.
Change-log for MathMod-13.0 (15/11/2025)
1) Scripts generator to add thickness to iso/parametric surfaces
2) Undo/Redo commands for navigating through previous scripts
3) New scripts, Bug-fixes, code optimization and documentation update
For a complete list of changes made during the course of development, please visit: https://github.com/users/parisolab/projects/2
Plot 2D (plotting X vs Y) scatter plots directly to a compressed image file. Platform independent standalone package. Plot up to 12 series. ASCII options file. Console/Terminal and win32 GUI. Code is ANSI C with C++ encapsulation. Try it on the website.
Quake II Weapons Facotry (THE Team fortress for Quake II) meets Quake III Arena WFA. The engine is founded on Q2 GPL code, and uses the WFA media. Visit the main website for more details.
NecJGui is an antennas design tool, interface for Numerical Electromagnetic Code. It allows easily making NEC input files, and viewing them in 3D. It also contains a version of the simulator, so it's complete IDE for full-wave EM simulation.