Consider performing a The very feature-rich, multi-platform editor for scripting languages by ActiveState, Komodo Edit, was released as a zero-cost and open-sourced application in November of 2007.
Komodo Edit is fully built out of this source tree:
http://svn.openkomodo.com/openkomodo/browse/openkomodo
To try to help alleviate some confusion:
OpenKomodo is the chosen name for Komodo-related things that have been open sourced -- all of which is in the svn.openkomodo.com repository.
The http://www.openkomodo.com/ website is meant to provide details about open-source Komodo things.
- The primary open source Komodo IDE is the "Komodo Edit" editor.