Blockbutler - Real-time transaction notifications for the blockchain
CoinMarketCap - Crypto-currency market capitalizations.
CoinSocialStory - Website for monitoring crypto assets data
CryptoCompare - We bring you all the latest streaming pricing data in the world of cryptocurrencies.
Notif.me SDK - A Node.js lib to send all your transactional notifications
Coinranking.com - A mobile-friendly list of cryptocurrencies.