Site: orionx.com
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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".
Coingi was launched in early 2017. It is known that the platform maintains such coins as Bitcoin, Dash, Dogecoin, Litecoin, Namecoin, Peercoin, Vertcoin. Both deposit and withdrawal operations in Czech Koruna are free of charge. 
BCoin.sg was a centralized cryptocurrency exchange based in Singapore. The exchange was launched in 2018.  Deposits were free on the exchange. Margin trading option was not available on the exchange.  At the moment the exchange doesn’t work and there is no official information about when the exchange will be active again. All the official pages of the platform are down as well, including Twitter and Facebook. We will update information about the exchange as soon as it is active again.