AMX Mod is a MetaMod plugin that allows you to write scripts for Half-Life and its Mods, using Compuphase's SmallC scripting language.

It lets you:

• generate special FX with sound (f.e. lightning, explosions, shockwaves)
• catch client and log events to display or collect various informations (UCStats)
• register new CVars, server and client commands
• display MOTD windows, HUD messages, menus
• send messages to clients, server and logs
• set various values on player like godmode, health, armor, position, rendering
• run commands on server, clients and bots
• create administrating/management/info stuff for servers/WWW (AMX MyStatus, EJL stuff)
• set new gameplay rules (Warcraft 3 XP, SuperHero Mod)
• do many, many other things (over 500 plugins)

Right now there are already some great plugins ready to download and use, in addition to basic plugins provided in the archive. Have a look at the Plugins section to get them all!

You can extend AMX functionalities by writing your own modules, that will provide additional native functions to be used in plugins.