Portable UCI- and XBoard-compatible chess engines.
Batch tools for creating Polyglot books and PGN-based statistics.
Scripts and tools for building and testing chess engines.
Parabator 2 - Free 3d board game
A TBS game written in C++ but the twist is its only console based.
Yet Another Chess ENgine
Link five, also known as 5-in-a-Row,is a traditional oriental game.