Best Free Microsoft Project Alternatives in 2026: 5 Apps Compared

Microsoft Project is serious scheduling software with a serious price — sold per user as a subscription (or a hefty standalone license), separate from Microsoft 365. If you manage a handful of projects rather than a construction megaproject, that cost is hard to defend.

Honest answer first: free Microsoft Project alternatives genuinely cover Gantt charts, task dependencies, and basic resource management — the core of what most Project users touch. What they don't fully replace is the deep scheduling engine, portfolio tooling, and clean .mpp interchange.

Below we compare five options — three full open source planners, one flexible boards tool, and one honest wildcard — and finish with a reality check on opening .mpp files. Our methodology sets out how we assess apps.

Quick picks

• If you want the most complete free replacement → choose OpenProject
• If you need to open .mpp files today → choose ProjectLibre
• If you want simple Gantt planning on the desktop → choose GanttProject
• If you think in boards but want to self-host → choose Focalboard
• If your "project plan" is really a task list → choose Trello (and know its limits)

Comparison table

OpenProject — best full replacement

OpenProject is an open source, web-based project management suite. The community edition is free to self-host; the vendor also sells a hosted cloud version and an enterprise tier with extra features.

Where it shines:

• Interactive Gantt charts with task dependencies, milestones, and baselines.
• Goes beyond scheduling: boards, time tracking, budgets, wikis, and meeting management in one place.
• Real multi-user collaboration with roles and permissions — this is team software, not a solo desktop app.
• Active development and an auditable codebase.

Where it falls short:

• Self-hosting requires a server and some administration comfort; the easy path (their cloud) is paid.
• Feature depth means a real learning curve for small teams.
• Direct .mpp import isn't supported; migrations go through Excel/CSV.

Choose it if: a team is replacing Microsoft Project, not just one planner — and someone can run a server.

ProjectLibre — best for opening .mpp files

ProjectLibre is an open source desktop app built explicitly as a Microsoft Project replacement — including the file format. It runs on Windows, macOS, and Linux.

Where it shines:

• Opens Microsoft Project files directly — the headline feature nothing else here matches.
• Familiar territory for Project users: Gantt charts, WBS, critical path, earned value costing.
• Resource assignment and leveling across tasks.
• Fully offline desktop software; your plans stay on your machine.

Where it falls short:

• The interface feels a decade behind; expect function over form.
• Single-user desktop model — no built-in collaboration (a separate cloud product is in the vendor's pipeline).
• Complex .mpp files can import with quirks: custom fields, calendars, and some constraints may need fixing.

Choose it if: clients or colleagues send you .mpp files and you need to open, edit, and return them without buying Project.

GanttProject — best for simple desktop planning

GanttProject is a free, open source desktop tool that has been quietly maintained for many years, funded by donations. It does Gantt charts and resource loads, and very little else — deliberately.

Where it shines:

• Clean task hierarchy with dependencies, milestones, and a resource load chart.
• Imports and exports Microsoft Project formats, and exports to PDF, PNG, and spreadsheets.
• Small, fast, offline, and installable on anything that runs Java.
• Zero accounts, zero cloud, zero upsell.

Where it falls short:

• No cost management, baselining depth, or portfolio features.
• Old-fashioned UI, and mobile isn't a thing here.
• Single-user; collaboration means emailing files.

Choose it if: you want a straightforward Gantt chart for one project at a time, with no ceremony.

Focalboard — best for boards with structure

Focalboard is an open source project and task management app in the Notion/Trello mold: boards, tables, calendars, and custom properties. You can self-host it or run the desktop app.

Where it shines:

• Kanban boards, table views, and filters over the same tasks — structure without a scheduling engine.
• Self-hostable, so your project data stays on your infrastructure.
• Templates for sprints, roadmaps, and content calendars.

Where it falls short:

• No Gantt charts, dependencies, or resource management — it's not a scheduler at all.
• The original corporate sponsor has scaled back active development, and the project is now largely community-maintained; factor that into long-term plans.
• No .mpp anything.

Choose it if: your projects are lists of work items rather than dependency networks, and you want them on your own server.

Trello — the honest wildcard

Trello is a freemium kanban app, and let's be direct: it is not a Microsoft Project alternative in any scheduling sense. It's on this list because many people searching for one discover a board tool is what they actually needed.

Where it shines:

• The gentlest learning curve in project software; teams adopt it in an afternoon.
• Free tier covers boards, cards, checklists, due dates, and automation basics.
• Excellent mobile apps and integrations.

Where it falls short:

• No Gantt charts on the free tier (the timeline view is a paid feature), no dependencies, no resource management.
• Free tier caps the number of boards per workspace.
• Complex projects turn into a wall of cards with no critical path.

Choose it if: deadlines and checklists — not dependency-driven schedules — are your real requirement.

How to decide

Choose OpenProject if a whole team needs web-based planning with Gantt charts and you can self-host. Choose ProjectLibre if .mpp files land in your inbox. Choose GanttProject if you're one person scheduling one project. Choose Focalboard or Trello if you've realized you need organized task flow, not a scheduling engine — Focalboard for self-hosting, Trello for convenience.

The .mpp import reality check

This deserves its own section, because it decides the choice for many people. Microsoft Project's .mpp format is proprietary and undocumented, and every import is a reverse-engineered approximation.

In practice: ProjectLibre opens .mpp files directly, and GanttProject imports Microsoft Project formats too — both handle standard task lists, dependencies, and resources well. Expect friction with custom fields, exotic calendars, baselines, and macros. OpenProject, Focalboard, and Trello don't read .mpp at all; migration means exporting from Project to Excel/CSV first.

If your organization exchanges .mpp files as a contractual deliverable, test a real file before committing — and accept you may need to keep one Project license around as an export gateway.

What you give up by leaving Microsoft Project

Project's scheduling engine remains the deep end: multi-project resource pools, sophisticated leveling, cost baselines, and portfolio views that enterprise PMOs are built on. Its integration with the wider Microsoft stack — Teams, Power BI, enterprise permissions — has no free equivalent.

For a certified project manager running formal earned-value reporting, the free tools will feel thin. For everyone else, they're most of the value at none of the cost.

Bottom line

OpenProject for teams, ProjectLibre for .mpp survival, GanttProject for simple solo plans — all open source, all genuinely free. More team and planning software sits in Business & Teams and Productivity.

Features and pricing change — always check the official site before deciding.

Frequently asked questions

Can any free tool open Microsoft Project .mpp files?

Yes — ProjectLibre opens .mpp files directly and is the safest bet, and GanttProject imports Microsoft Project formats too. Fidelity is good for standard task lists, dependencies, and resources, and imperfect for heavily customized plans with custom fields, exotic calendars, baselines, or macros. OpenProject, Focalboard, and Trello don't read .mpp at all, so migrating to those means exporting from Project to Excel or CSV first.

Which free Microsoft Project alternative has Gantt charts and dependencies?

OpenProject is the strongest choice for teams, since it is web-based and self-hosted with interactive Gantt charts, milestones, and baselines. For one person working on the desktop, ProjectLibre and GanttProject both give you task dependencies and milestones offline. All three are open source and free to use.

Is Trello really a Microsoft Project alternative?

Not functionally — Trello has no Gantt charts, dependencies, or resource management on its free tier, and the timeline view is a paid feature. It is the right answer only when your project needs turn out to be task tracking rather than scheduling. Many people searching for a Project replacement find that a board tool is what they actually wanted.

Do free Microsoft Project alternatives handle resource management?

ProjectLibre and OpenProject offer genuine resource assignment and workload views, and GanttProject covers basic resource loads with a resource load chart. Focalboard and Trello track who a task is assigned to, not capacity or leveling. If multi-project resource pools and sophisticated leveling are central to your work, no free tool matches Project's scheduling engine.