Blockbutler - Real-time transaction notifications for the blockchain
Shapr - A completely free way to build your professional network.
Notif.me SDK - A Node.js lib to send all your transactional notifications
Wildcard - Discover, connect and meet people at communities
Pusher - Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.
LetsLunch - Do more with your lunch hour. Meet new people.