Based on our record, Unvanquished should be more popular than Team Fortress 2. It has been mentiond 4 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
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
Available on Steam: http://store.steampowered.com/app/440/. Source: almost 3 years ago
Tremulous - Tremulous is a free, open source game that blends a team based FPS with elements of an RTS.
Overwatch - Stylized team-based FPS
PunchLab - Track the strikes you throw at the punching bag
Warframe - Ninjas Play Free.
Timerly - A real interval timer
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.