The Bittrextracker was created initially to monitor the prices of AltCoins on the Bittrex exchange.
It provides recent prices for all the coins, as well as their daily volumes.
You can select which currency you want to see and how you want to order them (or volume name).
You also have access to quotations in U.S. dollars and BitCoin and can make conversions within the app.
When entering a coin, you have a list with the next 50 Buy and Sell orders, which allows you to analyze how you intend to act in the market :)