PythonCard is a GUI construction kit for building cross-platform desktop applications on Windows, Mac OS X, and Linux, using the Python language. Apple's HyperCard is one of its inspirations; simple, yet powerful. The main discussion list for PythonCard is at http://lists.sourceforge.net/lists/listinfo/pythoncard-users
This project is a member of these foundries:Python Foundry
The PythonCard homepage is http://www.pythoncard.org/ (this will redirect to whatever the real home happens to be)
The main wiki for PythonCard is http://wiki.wxpython.org/index.cgi/PythonCard
The WikiWikiWeb page for the code editor is http://wiki.wxpython.org/index.cgi/PythonCardEditor
the API for the editor control codeEditor uses is
http://wiki.wxpython.org/index.cgi/wxStyledTextCtrl
That's wxStyledTextCtrl (wxSTC) in wxPython which is based on Scintilla http://www.scintilla.org/