Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
V12 Data - V12 Data offers rich data sets with verified addresses and emails for personalized marketing campaigns.
Intercom Facebook integration - Read, manage & respond to Facebook messages from Intercom
SmoochBot - Open source on-boarding bot for conversational apps
Crypton.sh - SMS - Secure Anonymous SMS in the cloud (and a phone number)
Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors