X-Half-Life: Deathmatch (XDM) is an Unreal Tournament-style Half-Life 1 modification. XDM features Classic Deathmatch, Team deathmatch, Capture The Flag, Domination, Co-Operative, Last Man Stanging, Singleplayer game rules, new weapons, new high-quality maps, new hi-def models and lots of special effects. It is an Unreal/UT-style HL mod with tons of familiar stuff and atmosphere. 8) XDM continued where VALVe stopped. XHL provides extended features, effects and principles with FULL BACKWARD COMPATIBILITY. XHL pushes HL engine to its limits, don't underestimate the GoldSource! XDM - brings unreality to Half-Life since 2001!
Very interesting shot: a map made for Half-Life had 2 turrets on it. In XDM teamplay those turrets not only bring you frags but also don't hurt your teammates. Not just fun, PROFIT! :)