Btc.com (Mining Pool)

Basics

Open source mining pool owned by Bitmain. Update: has been sold to 500.com (16-2-2021).
Block explorer
Wallet service
API-provider
3-12-2016 currently not signaling support for Segregated Witness, decision will most likely also depend on Bitmain’s preference. According to Bitcoin Core website BTC’s status on SegWit is a “work in progress” so they seem Bullish
Also runs an Ethereum mining pool now.