Exodus (role-playing game)

Exodus is a 2008 post-apocalyptic role-playing game developed and published by Glutton Creeper Games using the d20/OGL system. The game was originally set in the Fallout universe, but due to legal complications with the creator of the original Fallout intellectual property Interplay Entertainment, and Fallout's current copyright holder Bethesda Softworks, the license for the intellectual property was revoked.

Source: Wikipedia — Exodus (role-playing game) (CC BY-SA 4.0)