Universal Sacred Space
USS is a newish site on paganism, the occult, and that sort of thing. It does have an otherkin section and a few 'kin running around on it, but it's not that active a section as of yet.
I'm particularly fond of it as a general occult sort of forum, so I'd recommend anyone interested in such topics to check it out:
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"All that is gold does not glitter, not all those who wander are lost."-Tolkien
"All that we see or seem is but a dream within a dream."-Poe