ShapeShift!

exchange bitcoin with other peers for fiat or other cryptos.

Changelly is an instant cryptocurrency exchange with clear interface that provides the best prices for Bitcoin, Litecoin, Ethereum and other altcoins.

Cryptocurrency exchange for your digital currency needs. Open-source, API-based and anonymous conversion of crypto majors BTC (Bitcoin), ETH (Ethereum), LTC (Litecoin) and latest altcoins for trading.

CoinSwitch is the first cryptocurrency and altcoin exchange aggregator. It has integrated many leading exchanges like Bittrex, ShapeShift, Changelly so that people get best rates at one place.

Coinwale is an instant cryptocurrency exchange with clear interface that provides the best prices for Bitcoin, Litecoin, Ethereum and more.

Poloniex is a US-based digital asset exchange platform focusing on security.