Circular stairway tool (q3stairgen.zip)
hlq3map_convertor.exe
Command map icon making tutorial (by IndyJones)
Erik-Ftn's Wolfenstein ET Docs
Foghull (tutorial_foghull.zip) (by Obisdian)
Using hi-resolution external lightmap (Smokin' Guns & Q3 mapping)
Modifying a BSP (Binary Space Partitioning)
Rjukan (MOH:AA)
Measurement Entities (measureutil4.zip)
http://robotrenegade.com/temp/radiant16/gtkradiant-selection-controls-comparison.png
http://forums.urbanterror.info/topic/19651-zeroradiant-featuresbug-fixes/
http://www.splashdamage.com/forums/showthread.php?t=10367&page=2