SciTE is a SCIntilla based Text Editor. Originally built to demonstrate Scintilla, it has grown to be a generally useful editor with facilities for building and running programs. It is best used for jobs with simple configurations - I use it for building test and demonstration programs as well as SciTE and Scintilla, themselves.
SciTE is currently available for Intel Windows (XP or later) and Linux compatible operating systems with GTK+. It has been run on Windows 7 and on Fedora 12 and Ubuntu 10.10 with GTK+ 2.20. Here is a screenshot of SciTE.
You can download Scintilla and SciTE.
For OS X, there is a commercial version of SciTE available from the Mac App Store.
Homesite : http://www.scintilla.org/