GameRant on MSN

7 Single-Player FPS Games Perfect From Beginning To End

Very few shooters come close to perfection, but these FPS games start, continue, and end as 10/10 masterpieces.
GitHub

rts-game

Unvanquished is a free and open source FPS/RTS hybrid game powered by the Daemon game engine. Historically based on Tremulous as a continuation with decades of work over it.