If you want to do Half-Life modding, you can come a long way just scripting using AMX Mod X[0]. AMX Mod X has 260K LOC[2]. For comparison, the SDK has 273K LOC,

If you want to do Half-Life modding, you can come a long way just scripting using AMX Mod X[0]. AMX Mod X has 260K LOC[2]. For comparison, the SDK has 273K LOC, but that's mostly headers. Plugins are written in Pawn (formerly known as Small) which is compiled and then interpreted. AMX Mod X is GPL. For example, there's the SuperHeroes mod, which is also open-source[1]. Here are two videos demonstrating how radically gameplay was adjusted in SuperHeroes: https://www.youtube.com/watch?v=IGmCKQ57z-Y https://www.youtube.com/watch?v=IGmCKQ57z-Y https://www.youtube.com/watch?v=1vY7bBhXA0k https://www.youtube.com/watch?v=1vY7bBhXA0k [0]: https://github.com/alliedmodders/amxmodx https://github.com/alliedmodders/amxmodx [1]: https://svn.alliedmods.net/viewvc.cgi/amxmodx_plugin/trunk/plugins/?root=superhero https://svn.alliedmods.net/viewvc.cgi/amxmodx_plugin/trunk/p... [2]: https://www.ohloh.net/p/amxmodx https://www.ohloh.net/p/amxmodx