Можно на движке source, можно на другом. Например старый добрый HL1-multiplayer

"ageofchivalry" - Age of Chivalry в Steam
"diprip" - D.I.P.R.I.P. Warm Up в Google
"dods" - Day of Defeat: Source (англ.), Day of Defeat: Source (рус.)
"dystopia" - Dystopia в Steam
"esmod" - Eternal Silence в Google
"garrysmod" - garrysmod Silence в Google
"hl2mp" - Half-Life 2 Deathmatch в Google
"insurgency" - Insurgency в Google
"left4dead" - left4dead в Google
"left4dead2" - left4dead2 в Google
"smashball" - Smashball в Google
"synergy" - Synergy в Google
"tf" - Team Fortress в Google

"darkesthour" - Darkest Hour в Google
"defencealliance2" - Defence Alliance 2 в Google
"killingfloor" - Killing Floor в Google
"redorchestra" - Red Orchestra в Google
"ship" - The Ship в Google
"sin" - SiN Episodes: Emergence в Steam


Линейку и ВоВ не предлагать!)