Until 1999 (or so) there was a high traffic mailing list on a mail server located in Czech Republic. Unfortunately, the server with its mailing lists no longer works.
In 2001 XaoS moved to the SourceForge developer site and now there are 3 new mailing lists. Unfortunately, at the time of writing this documentation its traffic is about 0. Hopefully the development will continue using these mailing lists. Namely,
Please feel free to join any or all of these mailing lists and share your ideas with the developers.