I'm bullish for cryptocurrencies in general, but there is a lot of crap out there. Or just some projects which will never have a usable output, even the idea and team behind is trying hard. (MaidSafeCoin)
Poloniex:
Link: https://www.poloniex.com/marginTrading
Currencies: ETH, BTS, XMR, FCT, DASH, STR, XRP, LTC, DOGE, CLAM
Bitfinex:
Link: https://www.bitfinex.com/pages/stats
Currencies: ETH, LTC, BTC, USD