INSTEAD - Simple Text Adventure Interpreter.
Enigma is a puzzle game
puzzle game based on hexagonal tiles
Maze creation, solving, exploration, and analysis
General Purpose Engine for Graphic Adventures.
Opensource Game Studio
SDL-Ball is a DX-Ball/Breakout clone.
Portable game engine with main focus on point-and-click adventures
ball in labyrinth game
Tangram game
Extremely hard-core lander game.