Wall of Coins - Wall of Coins simplifies buying and selling Bitcoin, and no one else comes close! Wall of Coins and every participating app directly connects buyers and sellers.
Coinbase - Bitcoin, safe and easy.
changelly - Exchange alternative cryptocurrencies.
Binance - Cryptocurrencies exchange platform
BitStamp - Provide reliable and easy to use service for companies and individuals to exchange bitcoins.
Poloniex - US-based cryptocurrency exchange with maximum security