Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Sonar - 2-way chat with your customers over SMS and FB Messenger
Tidio - Tidio or Tidio Chat is an online chat software that combines messages from emails, website chat, and Facebook Messenger widget into a unified agent interface that allows agents to deal with all customer messages at the same time with the same tools……
ThroughMessage - Uncomplicated customer chat for ecommerce websites
Free HelpCrunch Live Chat - Free live chat & in-app messenger for startups
Sendblue - Programmatically send iMessage and SMS