Warzone 2100

A 100% free and open-source 3D real-time strategy game. Command the forces of The Project in a battle to rebuild the world after mankind has been nearly destroyed by nuclear missiles. Play versus your friends on a local network, or try your hand at online multiplayer with an integrated lobby. Play versus AI bots in local skirmishes (or as added teammates/enemies in multiplayer), and practice your skills with endless replayability. Over 400 different technologies yield an extensive tech tree with many paths to choose from. Customize your units with a flexible design system that allows for a wide variety of possible units and tactics. Supporting Windows, macOS, Linux, FreeBSD and more - all with cross-platform multiplayer support!