Site: polkaswap.io
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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. 
Accountless Crypto Exchanger.
SwapSpace is a crypto exchange aggregator that doesn't require registration. The platform provides an opportunity to swap around 300 cryptocurrencies suing fixed and floating rates. SwapSpace has a row of partnerships with such significant companies as Changelly, ChangeNow, and SimpleSwap. The main priority of SwapSpace is saving its customers' time by doing much of the work for them. The platform strives to provide its customers with trading at the most profitable rates. All the rates are gathered and displayed at one tab so the traders can compare the prices and make decisions on what to buy or sell without any hassle. The users can get assistance from the support team that works 24/7. What makes SwapSpace especially comfortable and transparent is the fact that is doesn't collect any fees above the fees charged by the partner exchanges.