RebelBB Forum with Source
Here's a nice little REBOL forum that I should mention: Forum REBOL, powered by RebelBB.
It's mainly a group of French speaking REBOLers, and since learning French has been a hobby over the last couple years, it's interesting and a challenge for me. The members have been kind regarding my awkward posts, and I appreciate the feedback. I know I have a long way to go to perfect my parlance.
Of course, if you don't read French, then the forum script itself may still be of interest. It is an open source (GNU) bulletin board with an IMAP back-end, written in REBOL of course. The source code for RebelBB looks clean and tidy, easy to read, thus making it easy to modify for your own needs.
Anyway, it's always good to see sites like this, and I'll try to make time, between so many projects, to drop in and say bonjour.