That's right, United Bitcoin is similar to an airdrop. During the last claiming phase, I think that addresses with activity between two block heights were automatically credited, without the need to register. Although, addresses needed to contain 0.01BTC IIRC. Previous claiming phases had different requirements. Altogether, I decided not to list that "fork" as it was too complicated and controversial to my taste.

On my site, I only list coins that were automatically credited to all, with the exception of Bitcore which requires 0.01BTC but it is a simple enough requirement so I left it there. Though, the main idea behind the site is to quickly find the coins that were forked. How would you feel about adding it to the list of other sites listed below your comprehensive list?

In the next hours or days, I'll display the UTXOs (transaction ID, index and amount) which should make it a lot easier for ymgve's bitcoin_fork_claimer users to claim their coins. I'm also working on displaying whether or not coins have already been claimed.