In early February 2009, fellow-ThoughtWorker Sunit Parekh and I released Mingle Sequence Diagram macro plugin.
This Mingle macro plugin helps users draw and collaborate on sequence diagrams (using www.websequencediagrams.com) in their Mingle wiki pages. Any changes to the diagram will be tracked by the wiki history.
The project is open source and available at RubyForge. Any ideas, suggestions or feedback will be appreciated. Please do let us know if you use it on your Mingle projects.
For those who don't know:
Mingle is ThoughtWorks' project management and collaboration tool. Custom macros can be made for it using the steps given here: Mingle Macro Development Toolkit