Open source exchanges

[OmegaStarScream]

I have no plans to run my own exchanges and I don't recommend anyone doing so unless they have the required knowledge to do so but I'm very curious, there are multiple exchanges that are open source like Multicoins, Peatio etc.

Does anyone know any open source projects that are actually being used by known exchanges? It seems like everyone is building his own exchange from scratch so I'm wondering why even build an exchange and make it open If there is no demand for it.

[JanEmil]

Peatio but a good userbase for this source
https://rubykube.io

I have testet a little for https://ripaex.io using rubykube. Looks like a fine source. Next build support shared orderbooks for multible exchanges.

Then there is the EtherDelta source if only ERC20. Have seen some add BTC chains on top.

[LeGaulois]

Used by know exchanges I have no idea of any but Loopring is open source and there were a few projects built on it. From wallet to DEXs

Loopring is an open-sourced and transparent protocol for building decentralized exchanges. Also, DEXs and wallets building on top of Loopring Protocol can combine off-chain order sharing and on-chain settlement. The following products all integrate with Loopring Protocol to provide digital assets trading functionality.

https://loopring.org/