Only 2 Real DEX's out atm with every component decentralized including orderbooks, no middlmen services

Katomic Dex ----> aka Komodo Wallet, aka atomic dex, aka hyperdex, aka barrrterdex, aka ....   been made aged a fine wine over the years
Qortal ---->  new and working now

Both use Real Atomic Swap Tech, even though qortal has not opened the ability yet to crosschain trade directly from x coin to y coin the ability is their so dont let the platforms coin fool you it dont work the same like all these bullony dex's that claim to be decentralized...