Kyber Network — provides rich payment APIs and a new contract wallet that allow anyone to seamlessly receive payments from any token. Users can also mitigate the risks of price fluctuations in the cryptocurrency world with derivative trading.
Bancor — a decentralized liquidity network that allows you to hold any Ethereum token and convert it to any other token in the network, with no counter party, at an automatically calculated price, using a simple web wallet.
0x — an open and non-rent seeking protocol that facilitates trustless, low friction exchange of Ethereum-based assets. Developers can use 0x as a platform to build exchange applications on top of. For end users, 0x will be the infrastructure of a wide variety of user-facing applications.