Deathmatch Classic

Description
Deathmatch Classic is a pure multiplayer game, designed as a tribute to id Software and the multiplayer gameplay in its older games. While very similar to multiplayer Quake, some elements of the game are borrowed from Half-Life, such as player models and the crowbar as the melee weapon. The idea behind DMC was to allow Half-Life players to play deathmatch games in the style of Quake and Quake II, but with the enhancements of the GoldSrc engine.
The game was originally released as a mod for Half-Life, and continues to use the GoldSrc engine. After its initial release, it was embedded into patches 1.1.0.7 for Half-Life and 1.0.0.2 for Half-Life: Counter-Strike. With the release of Valve's platform Steam, it was converted to a standalone release.