Vikunja
The to-do app to organize your life
...It’s a self-hosted, open-source app with a backend API and frontend clients that let you create tasks, organize them into lists or projects, set due dates and priorities, and collaborate with teammates or family members. Unlike many simplistic check-off lists, Vikunja provides options for nested tasks, recurring activities, and board views that give you flexibility in how you structure work or personal goals. Because it’s self-hosted and open, you retain full control over your data and can integrate it with other tools or automation workflows as needed, whether for personal productivity or shared planning.