CoinSwitch.co is a crypto currency and altcoin exchange aggregator. It's first of its kind in cryptocurrency domain. It has integrated with many leading exchanges like Bittrex, ShapeShift, Changeally, BlockTrades etc so people can get best exchange rate for their conversion.
It currently supports more than 100 cryptocurrencies and more than 4500 currency pairs for conversion.
This is also the best platform to exchange Litecoin: https://www.coinswitch.co/exchange/btc/ltc/0.1
It's worth giving a try.