3D game engine/framework in C, with Luajit and Python bindings now
A dead simple 2D game library for Go
For exploring cellular automata like Conway's Game of Life.
GemRB is a portable open-source implementation of the Infinity Engine
4X Space Strategy Game
Realism Invictus mod for Civilization IV
Arianne is an engine to develop multiplayer online games like Stendhal
Air traffic control tower and radar simulator (solo + multi-player)
Cooperative multiplayer graphical RPG and adventure game
a (simple) Sokoban game
Framework for producing web-based database applications
A game engine for console based text games
Komputerowy partner do gry planszowej "Stawka większa niż życie"
OpenSource and DIY real electronic darts game
A Sudoku puzzle game
Open source revival of the game Transarctica / Arctic Baron