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Kryptono is a centralized cryptocurrency exchange incorporated under  the law of Singapore. The KNOW token is the platform’s utility token. 
Bancor Network is a Decentralized cryptocurrency exchange. The exchange was launched in 2017. Its reported volume is about 40 millions of dollars. Bancor Network has 106 available trading pairs and 116 coins.
Update: The exchange is closed. CampBX is a platform where you can buy and sell Bitcoins in real-time from other CampBX users. Your buy or sell orders are matched against a parameterized database of other orders. If a perfect match is found, a Bitcoin-to-USD trade is executed instantly. If there are no matching orders at the price you specified, then your order can remain open for up to 31 days. To maintain fairness in trading, the CampBX platform has taken a purely-platform approach and CampBX is never a counter-party to any trade.