Satsuma is an easy-to-use and flexible graph library for .NET. It implements all the necessary graph structures and the fastest possible graph algorithms.
Symia is a minimalist C++ library for performing symbolic calculus. It is meant to be used by developers, as there is no graphical or textual user interface.
A note jotter that organizes ideas, notes, and facts in a heirarchy.
A Super Mario Bros. game.