Looking for a local, personal Kanban-board or task organizer - eviltoast

Heya, Looking for an app to track tasks I need/want to do and then immediately forget about. I’ve tried diary-apps but those don’t really work

So I’m looking for a private Kanban/task organizer, preferably f-droid or Github and offline. I have a public Nextcloud account, if that helps, but don’t really need this to be cloud-dependant.

Thanks in advance.