A number of associations exist on SDN; ranging from groups that have their own subforums, to those which are informal arrangements between like-minded members with no formal subforum.
Official groups are visible and open only to registered members and even then many require permission from existing members and/or Mini-mods, typically after a vote.
The current listing of usergroups on SDN is:
Pages in category "Usergroups"
The following 15 pages are in this category, out of 15 total.