Ain't Fate A Funny Thing
So here I am lamenting the lack of free (well, open source, but free is good enough) single player FPS games, and up pops this on Freshmeat; Excalibur: Morgana's Revenge : EMR 3.0 is a unique scenario based upon the Aleph One (Marathon) engine. It is a first-person action adventure game, featuring an epic and in-depth story line. The Aleph One engine is hardly cutting edge (originally powering the Marathon trilogy of games, circa 1996-1998) as you can tell from the EMR screenshots , but it takes a long time to produce a fully fledged single player FPS. EMR boasts 42 SP levels and a decent storyline. The game works on all 3 major platforms (Lin, Win, Mac) and is downloadable from their Sourceforge project page . I don't have time to verify how open source this game is but the source code is listed amongst the downloads. Another free single player game based on the same engine is Tempus Irae , which is based in the Marathon universe but adds a lot of new content. The origin...