AlliedModders is an open-source development community. We are primarily focused on server-side modifications to any and all games on the Half-Life 1 and Half-Life 2 platforms. Primary projects:
http://www.sourcemod.net/
SourceMod is an extensible, actively maintained server administration and scripting project for Half-Life 2. Its goals are clean API, good documentation, and high performance.
http://www.amxmodx.org/
AMX Mod X is an extensible server administration and scripting project for Half-Life 1. It is now maintained on a need-basis only.
http://www.metamodsource.net/
Metamod:Source is a powerful C++ plugin loader and API for Half-Life 2. It wraps a highly versatile library for detouring virtual functions.
AlliedModders public links:
Private tools for project owners: