LabiDesk is a Helpcenter software with multiple support channels: Knowledge Base, Shared Email Inbox/ Ticketing System, HelpWidget, Chat. It helps manage incoming requests, onboarding, and communication with the customers.
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Beseda - Async video and audio messaging for remote teams
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Slack - A messaging app for teams who see through the Earth!
HelpDesk - The easiest help desk system for a team like yours.