Citadel
Citadel, a.k.a Cytadela, is an FPS released for the Amiga in 1995, and multi-platform open source project since 2006, in which you have to stop a riot on an prison island.
Developed by
Virtual Design
Published by
Black Legend Ltd., Arrakis Software
Platforms
Amiga, Mac, PC, Linux
Genres
First-Person Shooter, Action-Adventure