Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop

Outbound Apps by Intercom - Embed apps right inside your messages

Pushbullet - Pushbullet - Your devices working better together

Intercom App Store - Integrate with Intercom and grow your business

Gotify - a simple self-hosted server for sending and receiving messages