Programming/Scripting:
Bluefish (PHP),
Vim (PHP/C++),
Scite (all),
Screem (X/HTML),
Quanta (all)
Version Control: Subversion/CVS
Graphics:
The GIMP (don't know how to use it too well, I miss Photoshop) (raster),
InkScape (vector)
Browser:
Mozilla Firefox