[sciborg2]

Over on Planewalker we have Life in the Day of a Planar

http://www.planewalker.com/forum/day-life-planars?page=1

and Parallel Wheels:

http://www.planewalker.com/forum/enumerating-parallel-multiverses

The latter probably requires some cursory knowledge of the D&D Great Wheel cosmology, but the former can be thought of as a place for varied fantasy stories.

The Parallel Wheels threat starts off enumerating possible parallel Great Wheels then slowly builds up organizations and recurring characters.
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Special Containment Procedures

A collaborative fiction site where people write about creepy objects/places/people.

Here's the one that has kept me up 2 nights running:

Ronald Reagan Cut up while talking.

Is Baztek on these boards? Cause he has one in there that's also great.

There's spin-off Wikias from the SCP site but I haven't plunged deeply into those yet.