GitLab Issue Board
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I never liked Jira because it's always, in every installation I've used slower than Bugzilla. So, I've preferred Mantis, Flyspray or Redmine for their responsiveness while being still featureful, so if GitLab can make the issue board fast enough (faster than Jira and Bugzilla), then I'm excited. Assuming it will land in GitLab core edition, of course.