I played Warsow recently, and it isn’t really my cup of tea. The parkour skills required feels like I’m in a bunny-hopping contest, which is not my preferred play style. It is very pretty though!
It is based on a sci-fi novel, so I always thought of it as an FPS Witcher.
Cool things: GPL code and CC-BY-SA assets.
Also, in my GOG library. Huh.
Game page