Hi Reiter,

Welcome to PGD!

There are a few FPS engines floating around the community.

:arrow: Quake2Delphi -- Quake 2 open source translation to Object Pascal under Delphi

:arrow: Doom Conversions -- There are numerous just look through the My Projects forum and you'll see a couple that have recently been released.

:arrow: Area 52 -- A 1-on-1 FPS with Mechs for the PGD Dogfight Competition. Source code was a requirement so you can find it here.

:arrow: XTropper -- Looks quite interesting so you might get some use out of this. It's like an 'Aliens' (the movie) type of game. Clicky

:arrow: SpiderLand 3D -- This was based off the XTropper source. Same sort of game. Clicky

:arrow: Genesis Device -- Next gen FPS engine being developed right now. There is a game project and a release of engine source is supposed to be released really soon. Actually this one would be a great project to join as they were looking for extra members some time ago. Thread here with videos!