Scintilla is a free source code editing component which includes useful features such as syntax styling, error indicators, folding, code completion and call tips.

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.

The project includes SciTE (SCIntilla based Text Editor).

Source:Sourceforge & Scintilla