Pushbullet for Mac - Send your iOS notifications to your Mac
Muzzle - Silence embarrassing notifications while screensharing
Pusher Beams - Send push notifications programmatically at scale
Upscope Screen Sharing for Intercom - No-downloads screen sharing fully integrated with Intercom.
Dead Simple Screen Sharing - Simple screen sharing and audio conferencing software.
Socket.io - Realtime application framework (Node.JS server)