Warzone 2100

Warzone 2100 is a real-time strategy game written by Pumpkin Studios and published by Eidos Interactive. It was re-released as open-source in 2004 by the original developers.

Story
Years after nuclear missiles devastated the planet, a group of survivors have built a base and are trying to rebuild civilization. The game starts with your main base sending out three transports to remote locations, with the player taking command of the group constructing Alpha base.

Gameplay
The resources in the game are collected from Oil Derrecks, which gradually provide resources when paired with a power generator within the base. With resources, you can build defenses, construct units or perform research.

The game involves construction of customizable vehicles for combat. Each vehicle has a Chassis, either small, medium or large (in addition to the chassis variations for each faction), propulsion (wheeled, half-track, tracked, hover or VTOL), and a weapon. The weapon may be a standard weapon, a support system (e.g. repair or sensor), or an indirect fire weapon.