Coinbase - Bitcoin, safe and easy.
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.
Binance - Cryptocurrencies exchange platform
changelly - Exchange alternative cryptocurrencies.
Exodus.io - All-in-one app to secure, manage and exchange blockchain assets.
BitStamp - Provide reliable and easy to use service for companies and individuals to exchange bitcoins.