im gonna share my thoughts about some of these games in the future. for now, here's (mostly) a recommendation list
Action Quake 2
Alien Arena
Alien versus Predator
Bloodrails
Cat Warfare
Cocaine Diesel
Cube 2: Sauerbraten
Cyberfrags '69
Daikatana
Deathmatch Classic
Diabotical
Doom 2016
Doombringer
Dusk
Games Unite Testing Place
Glitch Arena
Goat of Duty
Half-Life Deathmatch
Hellreaver 2
Hexenworld
Krunker
Midair 2
Muffled Warfare
Netquake
Open Fortress
Prodeus
Quake 2
Quake 4
Quake Champions Classic
Quake Live
Quakeworld
Ratz Instagib
Red Eclipse
Red Faction 2
Redmatch 2
Reflex Arena
Sector's Edge
Shotgun Farmers
Sin
Skynoon
Soldier of Fortune
Splitgate
Star Trek Voyager: Elite Force
Starsiege: Tribes
Team Fortress
Toxxik
Unreal Tournament
Unreal Tournament 2004
Warfork
Wolfenstein: Enemy Terrirtory