Bitcoin Unlimited is on the rise.

BU is intriguing. Where do I learn more? Is the client a fork of Bitcoin Core? Are all pulls publicly traceable?

We have a rough website up. You could start by reading this:

http://www.bitcoinunlimited.info/articlesOfFederation

Yes, it is a fork of Core. And yes the pulls are publicly traceable. There is a link to the GitHub repo on the download page:

http://www.bitcoinunlimited.info/software

And here is a description of the changes that were made to Core (there's only been one BUIP so far):

https://bitco.in/forum/threads/buip001-unlimited-inspired-extensions-to-the-bitcoin-client.222/