Upayavira,
Since I know (don't I?) that you do some work with non-profits, you may have free use of jive, though the pricing page says non-commercial "discount" I thought it used to be free for that use: http://www.jivesoftware.com/products/pricing.jsp. Not open source but it's always looked good to me. The forums at Sun use it.
Jive is excellent and very extendable. Our CMS is exporting a portal based on jive for a large non-profit. It is not, however, free.
best, -Rob
I would love to see a unified open source list/browsable-archive/newsgroup application in java too! When James list support gets up to speed I was thinking of having another crack at one. (And ask Vadim what I want to do with it if I can find an open source full-text indexer with support for vector searches!).
Geoff
