Linear.

US modern issue tracker for software teams

Facts

BookStack (self-host)
Self-hosted documentation and wiki platform
EU · open-source
↗
Kanboard
French open-source kanban project management
FR · open-source
↗
Leantime
German open-source project management for strategy and execution
DE · open-source
↗
OpenProject
German open-source project management software with Gantt, boards, and BIM
DE · open-source
↗
Planka
German open-source kanban board as Trello alternative
DE · open-source
↗
ProjectLibre
open-source desktopprojectmanagementtool as an alternative to Microsoft Project
FR · open-source
↗
Redmine (self-host)
Classic issue tracking; self-hostable
EU · open-source
↗
Restyaboard
open-source Kanban-bord and project management tool with comprehensive features
DE · open-source
↗