Hosted Sites
MSE Custom Script
A free file uploading forum and library for custom Magic Set Editor Scripts

Fax Encyclopedicus
A D&D 3.5 Focused mediawiki for homebrew material mostly by Fax Celestis

Victorious Press
A recently design group and soon company intending to keep 3rd party support for d20 3.5

Answellar
A wiki for the world of Answellar -
the works of Saithis Bladewing

RPG Web Profiler
A Web-based Character Profiler hosted here.
Random Scripts
D20 Class Table Generator
This is a library and generator for custom class tables for d20 - usable on many forums.
(recently updated, old version here

D20 Monster Table Generator
This is a generator for custom monster blocks for d20 - usable on many forums.