Aside from Etherdelta and IDEX, you can use Radarrelay to trade ERC20 tokens to ETH but always remember to consult your manager or the developers itself first about what exchanges they're gonna release the said tokens to be tradeable publicly easily or you can wait for their announcements cause there's a lot of exchanges for ERC20 tokens and eth, make it sure your wallet have eth balance as they needed for the transactions of the trade, otherwise it will not work on your end.