You can see the price of cryptocurrencies by google or through the exchanges but if you are looking for more in-depth data and insights check out these sites.
Altcoins Racing – Altcoins Racing monitors the change in cryptocurrency exchange rates within a day, a week or a month.
CoinMarketcap – cryptocurrency market cap rankings, charts, and more.
Coincap – CoinCap Rankings
Cryptowatch – Live price charts and market data for Bitcoin, Ethereum, and more.
Bfxdata – Charts and Stats for Bitfinex market data and margin funding BTC LTC USD
Bitcoinwisdom – Live Bitcoin/Litecoin charts with EMA, MACD and other indicators.
Bitinfocharts.com – Bitcoin, Litecoin, Namecoin, Dogecoin, Peercoin, Ethereum – price, reward, difficulty, hashrate, market capitalization, block time, blocks count.
Flippening Watch – Tracking the rise of Ethereum and other cryptocurrencies.
Coindex – Coindex lets you stay up to date with the cryptocurrency markets you want to watch.
WorldCoinIndex – Cryptocoins ranked by 24hr trading volume, price info, charts, market cap and news.
CryptoTrader – Cryptotrader allows you to backtest and fully automate your strategies by trading robots running on our scalable cloud 24/7.