The SciTE text editor is an open source multi-platform text editor.

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.

From the SciTE web site at https://www.scintilla.org/SciTE.html .

SciTE has Lua embedded in it as a scripting language.