Bitcoin’s long-running block size debate has seen numerous challenges to the Bitcoin Core reference software, including Bitcoin Classic, Bitcoin XT, and Bitcoin Unlimited. Recently, a fourth contender has entered the ring, a browser-based Bitcoin node client from Purse, called bcoin.

https://bravenewcoin.com/news/competitors-segwit-and-extension-blocks-make-quick-work-of-common-threat-asicboost/