Confluencer is a FrontEnd of Atlassian Confluence. It's written in Delphi 7 Ent using Confluence Remote API. Confluencer.NET is written in C#. http://confluence.atlassian.com/display/CONFEXT/Confluencer
Rich Browser Platform provides tabbed web browser by default and plugin architecture. So everyone can extend for one's purpose under CC License (http://creativecommons.org/licenses/by-nc-sa/3.0/).
Now, 0.3 supports IronPython.