The Enthought Tool Suite http://code.enthought.com/ is a set of open source tools in PythonLanguage.
Quote from http://code.enthought.com/projects/
The Enthought Tool Suite (ETS) is a collection of components developed by Enthought and our partners, which we use every day to construct custom scientific applications. It includes a wide variety of components, including:
It can be installed on various systems. Installing it on UbuntuLinux I had some problems sorting out the PythonLanguage dependencies and making sure they were all installed. -- JohnFletcher