6 Best Open Source Alternatives to Microsoft Office

1.ONLYOFFICE Docs

6.6kAGPL-3.0Shell Self-host

ONLYOFFICE Docs is a free collaborative online office suite with viewers and editors for text documents, spreadsheets, presentations, forms, PDFs, and diagrams. It is fully compatible with Office Open XML formats - .docx, .xlsx, and .pptx - and supports real-time collaborative editing.

• Editors for text documents, spreadsheets, presentations, forms, PDFs, and diagrams
• Real-time collaborative editing
• Office Open XML compatibility for .docx, .xlsx, and .pptx
• Reviewing, spell-checking, accessibility features, and dark mode

2.LibreOffice

4kGPL-3.0C++

LibreOffice is an integrated office suite for personal productivity. It is compatible with most document formats and standards, and includes applications for writing documents, working with spreadsheets, creating drawings, and building presentations.

• Writer for word processing documents
• Calc for spreadsheets
• Draw and Impress for drawings and presentations
• Compatible with most document formats and standards

3.SOGo

2.1kGPL-2.0Objective-C Self-host

SOGo is a free and open source groupware server for calendars, address books, and mail. It is built for businesses and communities that need shared collaboration tools in one web-based system, with a focus on scalability and open standards.

• Calendaring and address book management
• AJAX-based webmail client
• Resource sharing and permission handling
• CalDAV, CardDAV, GroupDAV, and ActiveSync connectivity

4.GanttProject

1.1kGPL-3.0Java

GanttProject is a free project management app for desktops. It plans work with task hierarchy, dependencies, milestones, and baselines, and tracks who does what with a resource load chart and task cost calculation.

• Task hierarchy, dependencies, milestones, and baselines
• Gantt chart with optional PERT chart generation
• Resource load chart and task cost calculation
• Export to PDF, HTML, and PNG

5.TaskJuggler

805GPL-2.0Ruby

TaskJuggler is project management software for serious project managers, covering work from the first idea through completion. It handles task scoping, resource assignment, cost and revenue planning, risk management, and communication management, going well beyond simple Gantt chart editing.

• Optimizing scheduler for timelines and resource assignments
• Resource leveling and task conflict resolution
• Unlimited baselines for what-if analysis
• HTML reports, CSV export, and iCalendar export

6.LibrePlan

347AGPL-3.0Java Self-host

LibrePlan is a free software web application for project management, monitoring, and control. Its desktop-like web interface lets every team member take part in planning, so the schedule stays current in real time across multiple projects and shared resources.

• Resource management for machines and workers
• WBS-based planning with multiple detail levels
• Automatic resource reallocation to reduce overload
• Monte Carlo simulation for completion dates