* [Apache Bloodhound](https://bloodhound.apache.org/) - Manage software products, Keep track of features, tasks and bugs `Apache``Python`
* [Bugzilla](https://www.bugzilla.org/) - General-purpose bugtracker and testing tool originally developed and used by the Mozilla project. `MPLv2``Pearl`
* [bulldog](https://github.com/infews/bulldog) - HTML5 task manager, built on todo.txt `MIT``HTML5`