Vikunja

Vikunja is an open-source, self-hosted to-do and project management app with lists, Kanban boards, reminders, and labels — a self-hosted alternative to Todoist and Trello. This template deploys the unified Vikunja container (frontend + API, web UI on port 3456) on a built-in SQLite database — no external database required — with the database file and uploaded attachments stored on persistent storage (/data). On first launch, open the app URL to register your account.

Source: GitHub