Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Trello for Slack - Organize anything with anyone, inside Slack
HelpSpace - The team inbox with super powers
Drift - A messaging app that helps you grow your business.
Halp - Slack-first ticketing for internal helpdesk
typedesk - A shortcut to all your canned responses