Prometheus is a third party Modification of Doom 3. Based on the movie released in 2012. The Mod describes itself as completely unrelated to any of the games from the Aliens and the Aliens vs Predator franchises. The project was finally released in April 19, 2013.
The project was possibly in development back in 2008 in secret and was never even shown to the public until 2012 two months after the movie release. The project has announced the possibility of a standalone version.