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Maxima is a fairly complete computer algebra system written in Lisp with an emphasis on symbolic computation. It is based on DOE-MACSYMA and licensed under the GPL free software license. Its abilities include symbolic integration, 3D plotting and solving differential equations.
Computable Archive of Mathematics project’s progress in representing abstract concepts of function spaces, topological spaces, general topology in the Wolfram Language.
Wolfram's Director of Technical Communication & Strategy, Jon McLoone, shares his thoughts on why it would not have been possible to create the Wolfram technology stack using a free and open-source model.
StoneKnifeForth This is StoneKnifeForth, a very simple language inspired by Forth. It is not expected to be useful; instead, its purpose is to show how simple a compiler can be. The compiler is a bit under two pages of code when the comments are removed. This package includes a “metacircular compiler” which is written in StoneKnifeForth and compiles StoneKnifeForth to an x86 Linux ELF executable. There is also a StoneKnifeForth interpreter written in Python (tested with Python 2.4). It seems to be about 100× slower than code emitted by the compiler. (All of the measurements below may ...