Heroes of newerth : HON Dota-like

Teeworlds : worms /soldat

Warsow : quake-like
UrbanTerror : cs-like
Enemy Territory : dod-like

on Linux

Heroix Game Launcher : Epic linux launcher

https://usebottles.com
Lutris

https://www.fosslinux.com/97141/epic-games-on-linux-a-comprehensive-guide-to-the-launcher.htm