Earth Reborn is a set of free wargames rules for post apocalypse games.
post apocalypse
Across The Dead Earth Post Apocalyptic Skirmish Rules
Across The Dead Earth is a commercial product, but for now, the company offers a free pdf version.
Post Apocalypse Car Paper Models
Greywolf offers a large selection of paper models of post-apocalypse style cars scaled for 15mm/20mm as well as a few designed for 25mm / 28mm. Scaling the figures with a printer should not be a problem, though.
Fallout Skirmish Game
Fallout Skirmish is a set of free wargames rules for skirmishes in the Fallout Computer Game universe. The rules are heavily influenced by Necromunda.
Savage Survive Skirmish Rules
Savage Survive Skirmish is a set of free wargames rules for games set in a post apocalyptic winter.