I recommend Tradeqwik.
They're a bit rough right now, but I think they plan to really put the DEX model into play, once they finish some updates.
They sold some shares, and other products, and are using the funds to hire developers to continue production of a more finished product. I think they're having a logo contest right here on Steemit. It's still going if you look for their account @tradeqwik.