HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Trello for Slack - Organize anything with anyone, inside Slack
Ticksy - Simple, beautiful customer support.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Liveo.Chat - No one wants to talk to bots, chat with your customers
Halp - Slack-first ticketing for internal helpdesk