Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

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JIRA is a project and issue tracker from Atlassian.

JIRA is a project and issue tracker from Atlassian. It integrates with the rest of Atlassian's suite of products.

More information available here: https://www.atlassian.com/software/jira

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