Blockbutler - Real-time transaction notifications for the blockchain
Bitcoin Price - Live charts + everything you need to know about crypto coins
Notif.me SDK - A Node.js lib to send all your transactional notifications
Bitcoin Volatility - Silicon Valley's Bitcoin price alerts for everyone 🤑
Pusher - Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.
Bitbo - Real-time Bitcoin dashboard