Ethereum Push Notification Service - Protocol for incentivized, blockchain based notifications.
Cool Cousin - Shaking up the travel world with good old human connection
Blockbutler - Real-time transaction notifications for the blockchain
FriendsTonight - Meet new friends to join your friends, tonight
Notif.me SDK - A Node.js lib to send all your transactional notifications
Overnight - Book a last minute room with locals, in seconds.