The Half-Life series spawned countless mods, among which many that became highly popular in the Half-Life gaming community. Some original mods, such as Counter-Strike, Team Fortress, Day of Defeat, Ricochet, The Ship and Alien Swarm have been "adopted" by Valve and made into commercial games. However some mods such as Garry's Mod having been turned into commercial games remain independent. My top multiplayer half-life mod : Day of Defeat, Natural Selection, Opposing Force CTF, Counter Strike, Team Fortress Classic
DOD Mod Pack for Half-Life with SturmBot and waypoints.
A CTF Mod Pack for Half-Life with HPB Bot and waypoints.
A TF2 Mod Pack for Team Fortress Classic with FoxBot and waypoints.
RCBot with waypoint for Natural Selection classic.
Alien Versus Predator mod with RCBot for Natural Selection Mod