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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. 
Heat Ledger Ltd was started in Finland in 2016. As of now, this is the brand name for wallet and a decentralized exchange. HEAT Wallet & DEX offers a modern crypto wallet and non-custodial exchange service. 
Cobinhood is a centralized cryptocurrency exchange based. The exchange was launched in 2017. Deposits are free on the exchange. Cobinhood doesn't have a fiat deposits option. Margin trading option is available on the exchange. The exchange has 3.5 score on Trustpilot, based on 8 reviews. Cobinhood is quite active in social media, with more than 52000 Twitter followers. You can leave your review about Cobinhood here.