Open Source Alternatives to Microsoft 365
A cloud-based office suite that provides Word, Excel, PowerPoint, Outlook and other productivity apps with integrated AI assistance for creating, analyzing and collaborating on documents.
Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to Microsoft 365 give you an option you fully own. Run them on your own server or desktop, so your data stays under your control. This page lists 6 open source alternatives to Microsoft 365. The most popular are Draw.io, Mail-in-a-Box and CryptPad. Most use the AGPL-3.0 or Apache-2.0 license, and 2 offer an official Docker image.
Draw.io
Create flowcharts, network diagrams, and organizational charts using a local desktop editor for visual documentation.
Mail-in-a-Box
A complete mail server appliance that automates the deployment of SMTP, IMAP, and DNS services.
CryptPad
A collaborative suite providing end-to-end encrypted document editing and file sharing for privacy focused team workflows.
draw.io
Create diagrams and whiteboards through a configurable editor that supports various storage integrations and offline desktop use.
ONLYOFFICE Docs
Provides collaborative online editing for text documents, spreadsheets, presentations, and PDFs with Office Open XML compatibility.
Modoboa
Mail hosting and management platform featuring an administration panel, webmail, and integration with Postfix and Dovecot.
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