Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
LeadMaster - The LeadMaster LeadMasterCRM All-in-One solution includes: marketing automation, lead management, email marketing, website integration & much more.
Drift - A messaging app that helps you grow your business.
Servetel - Communication management solution
Talkus - Chat with your website users from Slack
Outreach - Outreach Is Your Sales Communication Platform