qeradiant.com main website
plugins section on qeradiant.com
quake 3 section on qeradiant.com
qeradiant.com file section
level editing forum on quake3world

Plugins

Curry - shader preview and editing
Q3Build - a frontend to the BSP tools
GenSurf - surface generator
PrtView - portal viewer plugin

Local files

Q3Radiant manual
gensurf README
PrtView README
TexTool Documentation
Q3Radiant shortcuts key list