Warzone 2100

In the late 21st century, the world's civilizations are wiped out by a series of nuclear strikes, seemingly caused by a massive malfunction of the new NASDA (North American Strategic Defense Agency) strategic defense system.
While most of the survivors form scavenger bands to survive, you are a member of a group named "The Project", that is more organised and seeks to rebuild civilization using pre-war technology.
Compared to other real-time strategy games, Warzone 2100 has a greater focus on artillery, radar, and counter-battery technologies, more frequent in-game cinematic updates as game play progresses, a massive research tree, as well as a vehicle design system.
Features
Fully open source
Single player campaign with full FMV support
Single player skirmish modes
An extensive tech tree with over 400 different technologies
* A vehicle design system
Notes:
To play multiplayer online port 2100 needs to be fowarded.
Please refer to your local router setting on how to do this.
Source code is available from GitHub from this location:
https://github.com/Warzone2100/warzone2100