FogBugz
FogBugz is an integrated web-based project management system  featuring bug and issue tracking, discussion forums, wikis, customer relationship management, and evidence-based scheduling originally developed by Fog Creek Software. History
FogBugz was re-branded as Manuscript at the end of 2017. On August 3, 2018 Manuscript was acquired by DevFactory. They renamed it back to FogBugz. References

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Project management software
Bug and issue tracking software
2000 software