The main development is happening on our GitHub page. Users are encouragd to contribute to the development with testing and patches. The wiki is also the product of a community effort, please go ahead and extend it if you have something useful to add to it.
The color schemes are also all user contributed, new ones can be submitted to the GitHub repository.
You can follow discussions and development on sup as well as ask for help on our mailinglist firstname.lastname@example.org. To subscribe send an email to email@example.com. You can also subscribe through https://groups.google.com/d/forum/supmua.
(regenerated as of from approx. 2009)
We used to have three mailinglists: sup-talk, sup-devel and sup-announce. With the shut down of Rubyforge these mailinglists were closed.