The best open source alternative to Microsoft To Do is Super Productivity. If that doesn't suit you, we've compiled a ranked list of other open source Microsoft To Do alternatives to help you find a suitable replacement. Other interesting open source alternatives to Microsoft To Do are: Vikunja and Donetick.
Microsoft To Do alternatives are mainly Task Management Tools but may also be Project & Work Management Tools or Time Tracking Tools. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Microsoft To Do.
Combines task management, time tracking, Pomodoro focus sessions, and GitHub/Jira integration in a local-first app for Windows, macOS, Linux, Android, and iOS.

Super Productivity is a task management app built around the idea that your tools shouldn't interrupt you. Everything runs locally by default. No accounts, no telemetry, no subscription. Your data stays on your device unless you actively choose to sync it via WebDAV or Dropbox.
It's aimed at developers, freelancers, and anyone who does focused, heads-down work and wants a single place to manage tasks, track time, and review progress without switching between five different tools.
Core task management covers quick-add, subtasks, notes, due dates, repeating tasks with granular schedules, and automatic rollovers for anything you didn't finish.
Board layouts are flexible. Flip between Kanban, Eisenhower matrix, compact list, or a custom view. Projects, tags, and folders let you organize work the way you actually think about it.
Focus and time tracking are built in. One-click timers with keyboard shortcuts, Pomodoro sessions with configurable breaks, and a distraction-free focus mode that hides everything except the task at hand.
Integrations pull work in from outside. GitHub, GitLab, and Jira issues import directly into your boards. Calendar sync via CalDAV gives you a full picture of your day alongside your tasks.
A few things that stand out compared to other workspace organizers:
The app runs on Windows, macOS, Linux, Android, and iOS. It's free, built in the open, and has an active contributor community.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
A powerful, open-source task management platform for teams and individuals, offering customizable workflows and seamless integration.

Vikunja is a versatile, open-source task management solution designed to boost productivity and streamline collaboration. Whether you're working solo or managing a team, Vikunja adapts to your unique needs.
Key benefits of Vikunja include:
Vikunja combines the simplicity of personal to-do lists with the power of enterprise project management tools. Its intuitive interface and feature-rich environment make it an ideal choice for individuals, small teams, and large organizations alike. Experience the freedom of open-source task management with Vikunja and take control of your productivity today.
Organize tasks and chores with intelligent scheduling, fair assignment, and collaboration features. Perfect for families and teams with smart notifications.

Smart task management that keeps individuals and families organized with intelligent scheduling and fair task distribution. Whether managing personal tasks or coordinating household chores, this tool provides robust assignment options and flexible scheduling.
Key features include:
Perfect for tablet installations in kitchens or offices, providing always-accessible task management for shared spaces. Open-source with privacy focus, offering web app, mobile apps, and self-hosted options.