Jira is a flexible bug tracker by Atlassian, written in Java. It is the only proprietary issue tracker reviewed here.
While I prefer Free/Libre and Open Source Software (FLOSS), Jira is very adaptable and free of charge for small teams of up to 15 people. Unlike Trac and GitLab, the different modules, such as the wiki and repository viewer, are separate products. If you need a wiki, you deploy one separately, and Atlassian's own Confluence Wiki is the one that integrates with the least amount of friction. Atlassian also provides a code browser called FishEye for code repository integration and browsing.
For small teams, Jira licensing is cheap, but it quickly becomes more expensive.
By default, Jira's workflow is much like the Bugzilla ...
