There are (at least) three Wiki website dedicated to Tolkien's works:
- Tolkien Gateway, The J.R.R.T. Encyclopedia.
- The One Wiki to Rule Them All (fandom.org), The LotR Wiki
- The Tolkien Wiki Community
and there's also
- The Encyclopedia of Arda, which isn't quite a wiki, but is somewhat wiki-like.
I notice that the third site seems much smaller, older, and looks like it hasn't been updated for a while (perhaps since as far back as 2003). But why are there three in the first place, and what is the rationale/focus of at least the first relative to the second?