Issue Tracking System
"Treenga helps project managers, UX designers and QA teams to create well-defined tasks/issues, easily organize them and track their completion.
It is some kind of mix of Dropbox Paper and Github Issues, so a “single task at a time” interface with task descriptions, and assignment features. Tasks are grouped by hierarchical categories, which represent your project structure, or be designed around task attributes such as milestones or urgency.
It is available as hosted service and open-source on-premise installation.
Treenga is built with Vue.js, and is based on the Element component library. The backend is built with Laravel."