Real Time Strategy game engine supporting early Westwood classics
Arianne is an engine to develop multiplayer online games like Stendhal
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Cross-platform real-time strategy game (3D)
Online War system for IL-2 Sturmovik and Iron Front in ArmA 2
A free 3d game for PC that does not limit the player. Fight,Build,Gain
Open source FPS/RTS Game
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
The forever free, ad-free and open source chess server
Fast and robust map analyser for Brood War.
Free strategy browsergame engine.