RetroArch is a frontend for emulators, game engines and media players.
Real Time Strategy game engine supporting early Westwood classics
A lightweight game server framework implemented with Actor Model
Gideros Release version
FlightGear Flight Simulator: free open-source multiplatform flight sim
A free transportation simulator game
RTS game with the theme of Strategy by Design
A modern, cross-platform Quake game engine based on FitzQuake.
Chess Database and PGN viewer
For exploring cellular automata like Conway's Game of Life.
A cross-platform port of Hexen II game.
Odamex is a free, cross-platform, modern client-server Doom engine
3D Engine c++
C64/Amiga emulator with PAL shader and runAhead
Android, UIQ 3.0, Series 60 Edition 5 open-source software
Cross-platform, GPL reimplementation of the classic : Syndicate
INSTEAD - Simple Text Adventure Interpreter.
Game engine supporting many 3D/2D formats and graphic effects
A 2D scrolling platform shooter, inspired by Duke Nukem 1
Game library for Pascal