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coinmarketcap.com is one of the most popular.
There is also coincap.io and cryptocompare.com which has more 'reports' on them.

Coin Marketplace

STEEM 0.04
TRX 0.33
JST 0.081
BTC 59794.17
ETH 1581.74
USDT 1.00
SBD 0.42