Most of all the etherium tokens that are ERC20 compliant can be sold at etherdelta as they are added there immediately after completion of ICO's. As for tokens that we randomly get at waves airdrops into are wallet, I guess there is no choice but to just hold them.
As mentioned above, the tokens based on waves can trade on wavesDEX, which is an exchange like etherdelta of " ETH", But I think the trading volume is not very low.