A Graphical Editing Framework(GEF), for Python. It provides a canvas similar to wxArt2D and a editing framework based on MVC. The framework can be used to develop scientific and engineering tools that require graphical editing.
TurboGears 2 is a web framework, but unlike some of its competitors, it's not a monolithic unit, it's a collection of libraries, WSGI components, and web development tools that works well together and is configured to provide a great out of the box.