List your ERC-20 tokens and their prices according to etherdelta best bid:
https://deltabalances.github.io/
Website for tracking ICO airdrops:
https://icodrops.com/
Watch most of cryptocurrencies live on specific-exchanges:
https://cryptowat.ch/
Easily Calculation and Gas Fee Estimator:
https://ethgasstation.info/
Wallet Explorer for Bitcoin Wawllets:
https://www.walletexplorer.com/
Blockchain Activity Matrix (Number of transactions for blockchains, etc):
http://blocktivity.info/
Arbitrage detections for exchanges:
https://cryptocoincharts.info/arbitrage
https://data.bitcoinity.org/markets/books/USD
https://coingap.org/
Most of Coin's purpose, category, rating:
https://coincheckup.com/
Coin compare website:
https://www.cryptocompare.com/coins/#/btc
New coin news:
https://cryptopanic.com/
Cryptocurrencies map and weights on crypto field:
https://cryptomaps.org/
Scam Checker for crypto websites:
https://fried.com/crypto-scam-checker/
Oversold and overbought coins detector:
https://rsihunter.com/
List coins ATH:
https://athcoinindex.com/