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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; source code 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
OpenPTV is an abbreviation of the open source particle tracking velocimetry. This is an open source framework, developed jointly by academic institutions, that deals primarily with the three-dimensional particle tracking experiments in complex and turbulent flows. More about 3D-PTV on Wikipedia and links from our website:
http://www.openptv.net
Varkon is a very powerful parametric 2D/3D CAD, modeling and application development tool for engineering, design, architecture, etc. It does 2D drafting, 2D and 3D modeling, sculptured surface modeling, and even animations. See our website for details.
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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.