SciTE (Programmer's editor)

SciTE is a simple yet very usefull editor that uses 
scintilla syntax highlighter. It supports many languages
including C, C++, Java, PHP, Octave, and more.

Authors: Neil Hodgson <neilh@scintilla.org>
License: free to use, copy, modify, distribute
Website: http://scintilla.sourceforge.net