Widelands is a free, open source real-time strategy game
Online War system for IL-2 Sturmovik and Iron Front in ArmA 2
RTS game with the theme of Strategy by Design
Seven Kingdoms: Ancient Adversaries
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Europa Universalis 4 save game editor
Arianne is an engine to develop multiplayer online games like Stendhal
Real-time Strategy
An enhanced version of 7K:AA (Seven Kingdoms: Ancient Adversaries).
RTSish Game Engine
A free 3d game for PC that does not limit the player. Fight,Build,Gain
Open source FPS/RTS Game
Utilities to make running a MegaMek server easier
The classic multiplayer strategy game for use as a BBS door
Cross-platform real-time strategy game (3D)
Java RTS framework
Mech Station Beta - Tower Defense like Game
A 2D Real Time Strategy space combat game.
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Open RealStrategyGameLibrary (Engine)
A suite of tools to make operating a Empire server easier
An approach where computer solves problems like a human brain does;