Slack with your Users - Speak to your app's users entirely within Slack
Intercom App Store - Integrate with Intercom and grow your business
Conversity - Easiest way to manage Facebook Messenger chats
Hotline - In-app chat,real-time engagement & self-service for your app
Avochato - Text messaging for your business.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.