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Lykke is the cryptocurrency exchange incorporated in Switzerland with offices across the world. Its products are open-source. Lykke is the initiative of the Oanda’s founder, a famous forex exchange trading platform.  
Namebase is an exchange registered based in San Francisco. To be more precise, Namebase is an onramp for Handshake and you can use its platform for buying and selling Handshake coins (HNS) as well as bidding on, purchasing, selling, and using Handshake names. The platform also supports Bitcoin.
Zebpay is a centralized cryptocurrency exchange established in 2014. With its help, one can buy/sell 6 crypto coins for euro as well as trade with 5 crypto-to-crypto pairs.