Hello AlgoFam 
Just to inform you that I made a small website to exchange ASA tokens using Algorand Atomic transfers (no smart contract/logic sig) :
www.algo-exchange.com
It is not beautiful but functionnal and free (only fees are the negligible Algorand transactions fees).
To sign transactions, it supports (for now) MyAlgoWallet and AlgoSigner.
You can test it on Testnet or use it directly on Mainnet.
It does not work on mobile yet but I am working on it.
I welcome any feedback