According to Atlassian, Jira is used for issue tracking and project management by over 170,000 customers in 190 countries. Some of the organizations that have used Jira at some point in time for bug-tracking and project management include Fedora Commons,Hibernate,and the Apache Software Foundation, which uses both Jira and Bugzilla. Jira includes tools allowing migration from competitor Bugzilla.
Jira contains four packages
Jira is written in Java and uses the Pico inversion of control container, Apache OFBiz entity engine, and WebWork 1 technology stack. For remote procedure calls (RPC), Jira supports REST, SOAP, and XML-RPC. Jira integrates with source control programs such as Clearcase, Concurrent Versions System (CVS), Git, Mercurial, Perforce,Subversion,and Team Foundation Server. It ships with various translations including English, French, German, Japanese, and Spanish.
Jira supports the Networked Help Desk API for sharing customer support tickets with other issue tracking systems.