3. HitBtc.com
They have an insane amount of trading pairs. I don't know of any other exchange to offer as many trading pairs as HitBtc. They also have decent volumes too.
the most puzzling thing for me up to now is HitTC, with all the little activities, deposits, trades, withdrawals, all these things with fees above the average market, but HitBTC still has high popularity, even though there is still a better market than that, some my colleagues also have problems when trading on hitbtc, their fees are really fierce