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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".
Oasis App is an open-source DeFi product developed by the Maker Foundation. An original OasisDEX project was closed in January, 2019. With the help of Oasis App, you can trade and borrow Ethereum tokens. 
Dex.top is a decentralized cryptocurrency trading platform offering trading with smart contracts (including but not limited to Ethereum, EOS and NEO). The platform describes itself as World’s First Multi-Chain Decentralized Exchange and claims to have top volume among other decentralized exchanges.