Widelands is a free, open source real-time strategy game
0 A.D. is a free, open-source, cross-platform real-time strategy game.
RTS game with the theme of Strategy by Design
Seven Kingdoms: Ancient Adversaries
Arianne is an engine to develop multiplayer online games like Stendhal
An enhanced version of 7K:AA (Seven Kingdoms: Ancient Adversaries).
The classic multiplayer strategy game for use as a BBS door
Utilities to make running a MegaMek server easier
Online War system for IL-2 Sturmovik and Iron Front in ArmA 2
Cross-platform real-time strategy game (3D)
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
A suite of tools to make operating a Empire server easier
An approach where computer solves problems like a human brain does;
These tools make running a Wesnoth MP server on Linux easier
God game: wage war from the stone age to the future
RTS game for learning Algorithm Design
Remake of the classic Caesar III game
A simple turn-based artillery game and also a real-time strategy game.