of oslo.town 
Vikunja is really nice:
Self-hosted planner. Set up projects, create tasks, kanban, etc. Assign tasks to other people (for team use), set deadlines and repeating tasks, make child and parent tasks. Very nice, slick application.
Managed European hosting too, if you prefer.
vikunja.ioVikunja: The open-source, self-hostable to-do appDiscover Vikunja, the open-source, self-hostable to-do app. Stay organized, collaborate with peers, and plan projects with elegance and privacy in mind.
