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HiOperator - HiOperator is a virtual assistant that answers phone calls, chats with customers, provides in-app help, takes orders, and provides support.
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Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Momondo - Find cheap flights with Momondo.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.