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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. 
Cat.Ex exchange platform was founded in mid-2018. Its headquarters is based in China. Providing its local token holders with dividends on a daily basis, Cat.Ex utilizes transaction mining in order to ensure an efficient profit-sharing. 
Changelly Pro is an extended version of the popular cryptocurrency trading platform Changelly. Unlike the original platform which is rather an aggregator of side cryptocurrency exchanges, Changelly Pro is a full-fledged exchange.