BioShock VS Unvanquished

I don't play shooters, but I do frequently visit some of my favorite streamers who play shooters. One game that I really enjoyed watching was the Bioshock series. The story was really good, and I highly recommend it, given it's 80% off for the entire series on Steam, definitely check it out. Source: over 2 years ago

Although I don't play shooters, I've watched a streamer play the entire Bioshock series in the past and the story was amazing. You play as Jack, the protagonist of the game where he got into a plane crash while flying over the Atlantic Ocean. Being the only survivor, he discovers an underwater city, and then asked to help stop the leader of the city. I definitely recommend for a single player. Source: over 2 years ago

I would recommend Unvanquished instead. It's basically the same game but FOSS, much more polished, and there's a small but active community. Servers are often empty, but people will eventually come if you join one and you can play against bots in the meantime. Source: about 1 year ago

I enjoyed Tremulous as well. There's currently a sort of revamp (ignoring GPP/Trem 1.2), called Unvanquished. https://unvanquished.net/. Source: over 2 years ago

Unvanquished the fork of Tremulous (who's not developed anymore) could fit. Source: almost 3 years ago

You're probably thinking of Tremulous, which is also forked as Unvanquished. Started life as a Quake 3 mod if I remember correctly. Source: about 3 years ago