Source Developer(s) Valve Corporation Release date(s) November 19, 1998 (with Half-Life ) [1] May 1, 2006 [2] Genre(s) First-person shooter Mode(s) Multiplayer Platform(s) Windows Distribution Steam Input Keyboard and mouse Engine Source Series Half-Life   Half-Life Deathmatch: Source is a Source engine port of the multiplayer portion of Half-Life . It