Site: 0x.org
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Bisq exchange was launched back in 2014. At that time it was one of the first Decentralized Autonomous Organizations (or simply DAO). According to the founders of this exchange, one of the goals of Bisq network is to "keep the original spirit of Bitcoin alive".
EtherFlyer is a decentralized exchange started in 2018. It maintains trading with pairs structured against BTC and ETH. 
Dcoin exchange is the digital asset trading platform supporting multiple chains. It was launched in 2018. Dcoin covers USDT, BTC, ETH and ETF markets.