Absurdism A very interesting site by a leopard therian. Quite refreshingly different.
Birds of a Feather Collaborative project to gather bird-related resources in a hub for bird-people
Eald of the Silver Elves One of the oldest groups publicly referring to themselves as elves, and authors of the "Magical Elven Love Letters".
Elven Cabal This is an old site, now defunct, that I dredged back up out of the Internet Archive's Wayback Machine. The rants are worth a read, and no not just the one I wrote. In fact, I'd say mine is the least useful of any of the rants up there, since it's a parody of a very specific incident in the history of the otherkin community and anyone unfamiliar with that incident won't get much out of it.
Elvin H.O.M.E. An intentional Elvin (sic) community in southern Indiana.
Eyovah’s Dragon Den The mirror of a site belonging to a dear departed friend. I learned much from him, though we knew each other less than a year in this life, and I still continue to learn more from all that he taught me.
Faedry: Are You A Faeid? Faeids are Humans, Faeries, or Faerie/Human Breeds or those communicated with by Faeries for the purpose of bridging the gap that has developed between humans and Faeries long ago.
From Fiction Website with info about Otakukin/Fiction-kin; otherkin whose past-life memories connect with characters and worlds from modern works of fiction.
Kinhost.org Website of an otherkin multiple and home of Multiplicity: The Missing Manual.
L/L Research A bit more newage take on otherkin, L/L Research refers to otherkin as "ETs who have come from elsewhere to planet Earth for this incarnation or at this time" and considers them a subgroup of what it terms "wanderers". Items of potential interest to otherkin on this site may include "A Channelling Handbook" and "A Wanderer's Handbook: AN Owner's Manual for ETs and Other Spiritual Outsiders", both available in the Library section.
Otherkin Haven Dreamwidth community where "Otherkin of all levels (and even 'kin-friendly non-kin) are welcome to share their experiences and ask questions with less fear of the outside drama, due to the community's protected nature."
Otherkin Timeline A timeline of the recent history of Otherkin, Therianthropes, Animal People, and Draconic People by O. Scribner. Possibly the best resource on community history, even surpassing current published works. Highly recommended reading.
Starlight Infinities This site is one of the best repositories of the things which are beautiful in the Otherkin community. Not to mention a very good example of them as well. While the owner and I don’t always agree on things, she remains one of the more magical people I know.
Synesthesia Symbiosis This site may not make sense to you when you’re first looking for information on otherkin, but as the years go by it’s one that you’ll probably find yourself going back to again and again. I know I do. It’s probably the single best resource on real elves that exists, in my opinion, and the site owner is a very interesting person who I am glad to have known even if we don’t always see eye to eye.
The Crow's Nest This site hasn't been updated in years, but some may still find it useful... it's one of the few sites still around in any form that has much posted in the way of otherkin memories, and unlike many others it doesn't fall into the trap of trying to organize those memories into a unified story. I believe it was also the first site to host a directory of otherkin.
Digital Elf's Elven-English Dictionary Another elven dictionary project, again borrowing much from the existing Elenari language projects. This one does appear to include additional words not found in the others, though their origin is unclear. Much of the site is heavily influenced by role playing games.
Lexicon Elandra Lexicon of words remembered from various elven languages, from a now-defunct website. This link goes to the archive.org version of the old site. Thought it might remain useful for folks exploring memories of nonhuman languages.
Starlight Infinities:"Remembered" Words A dictionary of words derived through the practice of a kind of glossolalia, attempting to express the "soundfeel" of various ideas. It is unknown if these words are from a nonhuman language, or even if they represent a single coherent language. Offered here to see what they spark in others.
Welcome to Shinoa A reference for Shinoarnii, a remembered draconic language that is also being used in original fiction by the person who remembered it.
The Otherkin Avatar Project A ritual written by a member of the vampire community and conducted as the closing ritual at Kinvention North in 2004. I personally classify this more as "magic done for otherkin" or "magic directed at otherkin" than as "otherkin magic", but possibly still of interest.