There are many exchanges most famous and used are Binance, Bitrex, Okex, Kucoin, and Idex. Personally, I use different sites where my assets are listed. I like Bitrex more because they dont ask for fees when listing coins and every project have the right to apply for listing.
some new exchanges is good for new ICO project because they easy to listed on that. but Bittrex is different, they prove that market still can have high volume without bigger risk for trader than new exchange with new tokens and more speculation