Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Intercom Facebook integration - Read, manage & respond to Facebook messages from Intercom
Chaport Live Chat - Chaport is a beautiful, simple live chat for websites designed as a modern messenger.✨
Crypton.sh - SMS - Secure Anonymous SMS in the cloud (and a phone number)
Firehose Chat - firehosechat.com
Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors