AMX Mod
AMX Mod is a metamod plugin for 
Half-Life. It provides comprehensive scripting for the game engine and its mods. Scripts can intercept network messages, log events, commands, client commands, set cvars, modify entities, and more.
History
In 2002, a project called Amx Mod starts. AmxMod is developed by "OLO" and is a plugin (module) for Metamod that includes many features and allows you to load "plugins" created from those features. This works for all Half-Life mods (
Counter-Strike: 1.x, 
Day of Defeat, 
Team Fortress Classic, 
Deathmatch Classic, and so on).
The goals of the project were as follows:
- allow easy management of servers
- allow any novice programmer to write their plugins in the Pawn language
- offer a large number of plugins for servers
