Vaults of Pandius

The Vaults of Pandius is a website devoted to keeping the old lore of Mystara and Blackmoor, at http://pandius.com. Since Hasbro doesn't do much with these settings (nor with the Tom Moldvay / Frank Mentzer BXCMI rules), and since we don't have Moldvay nor Dave Arneson no more, this site is as Official as these things get.

This is, quite literally, among the oldest 'sites on the whole wide 'web, starting 27 June 1996.

Here you can get Threshold, a newsletter for this fandom; and lots and lots of rules and supplements. Also here must be hundreds of fan-made modules and quite a bit of fan fiction. The standout is probably the Atlas section.