Elvenportal has a good list, but quite a few of the links are broken, so I've gone through and picked out ones that aren't! These are Sites that I found useful/informative. Please feel free to comment with sites you would like to see up here!
Silver Elves - A good starting resource! A group of Elves who help other elves find their place!
Elvin Portal- A lot of good resources involving Elfin exploration!
Elenari.net - Another good site for finding yourself/finding answers!
Rialian.com - More info about Elfinkin
Rialian.com - A non-Tolkien Elven language!
Catharism - A potential 12th-14th century Elfin group in France!
The Cathars/Catharism (2) - Hybrid DNA
Elfin Awakening - Elfin Blog with good information
Lostkin - Otherkin Memory Recollection
Eristic - Big resource, lots of resources to other sites too.
The Fair Folk - An Essay/Chapter about Elfin kind
Otherkin Resources - A sort-of mini-hub for resources of Otherkin.
Otherkin Fandom Wiki - FANDOM wiki site of Otherkin!
Elfkind Digest - A sort-of magazine/digest providing more info on Elfin'kin and Otherkin!
Tolkien High Elves - A discussion about Finnish centric games.
Wanya yassen i'taure e' seere, (Depart with the forest peacefully),