OTRS vs Zendesk


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OTRS
OTRS is a free and open-source trouble ticket system software package that a company, organization, or other entity can use to assign tickets to incoming queries and track further communications about them. Like alternative solutions it is a means of managing incoming inquiries, complaints, support requests, defect reports, and other communications.
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Zendesk
Zendesk is web-based help desk software with an elegant support ticket system & a self-service customer support platform. Agile, smart and convenient. Zendesk free open-source alternatives are osTicket, OTRS, Mantis
Zendesk has better video than OTRS

Face to face in the news:


2016 - Zendesk expands beyond the help desk to take on OTRS


Customer service app Zendesk unveiled a new product Zendesk Explore that provides analytics to measure and understand the entire customer experience. With Zendesk Explore, you get instant access to the customer analytics that matter—and the deeper understanding of your customers and business that comes with it. It's taking data from Zendesk’s myriad tools or third-party systems like customer data in Salesforce, buying history in Shopify or web analytics from Google Analytics and pulling it all together into one central place. It can deliver this information, regardless of role to get a much fuller view of the customer than you can get with bits of information trapped inside application silos.