vokoscreen is an easy to use screencast creator to record educational videos, live recordings of browser, installation, videoconferences, etc.
Yacas is an easy to use, general purpose Computer Algebra System, a program for symbolic manipulation of mathematical expressions. It uses its own programming language designed for symbolic as well as arbitrary-precision numerical computations. The system has a library of scripts that implement many of the symbolic algebra operations; new algorithms can be easily added to the library.
Atanks is a multi-platform Scorched Earth clone similar to the Worms series of games. Annihilate the other tanks to earn money, then spend it on bigger and better shields and weapons to wipe out the opposition.
GluCat is a generic library of C++ templates that implement universal Clifford algebras over the field of real numbers. The PyClical extension module for Python gives users an easy Python scripting interface for calculations in Clifford algebras. The name PyClical is an homage to Pertti Lounesto's CLICAL.
hbcxx uses the Unix #!/path/to/interpreter technique to make C++ (and C) source code directly executable. Modern C++, meaning C++11 or even C++14, feels like another language. This is not because the language has been changed massively but because the new features encourage a different, and slightly higher level way to think about writing C++. It's faster, more fun, supports lambdas, has tools to simplify memory management and includes regular expressions in the standard library. hbcxx is a to