Bisq exchange was launched back in 2014. At that time it was one of the first Decentralized Autonomous Organizations (or simply DAO). According to the founders of this exchange, one of the goals of Bisq network is to "keep the original spirit of Bitcoin alive".
CEX.io can be called one of the oldest exchange platform and can be used all over the world.
Today this exchange supports Bitcoin, Ethereum and the number of other currencies as well. CEX. io was established in 2013 in London as an exchange and cloud mining provider.
Founded in 2011, Paymium describes itself as the first Bitcoin exchange in Europe. It is registered in France as a SAS company and operates as a Bitcoin trading platform.