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Open365

Open365 is an open-source alternative to Microsoft 365 and Google Workspace, providing core productivity apps like word processing, spreadsheets, presentations, email, calendar, contacts, and more. It is free, customizable, and focused on privacy and data ownership.
Open365 alternatives ➤

What is Open365?

Open365 is an open-source, self-hosted alternative to commercial solutions like Microsoft 365 and Google Workspace. It provides core productivity apps including a word processor, spreadsheet software, presentation software, email, calendar, contacts manager, and more.

As open-source software, Open365 aims to give users control over their data and privacy. Rather than storing data on Microsoft or Google servers, Open365 enables users to host their own servers and retain ownership over their documents, emails, calendars, contacts, and other data.

Some key features and benefits of Open365 include:

  • Free and open-source - no license fees or ongoing costs
  • Self-hosted - data stays under the user's control rather than on third-party servers
  • Secure and private communications and data storage
  • Customizable - users can modify the software to meet their specific needs
  • Accessible from any desktop or mobile device via a web browser
  • Supports real-time collaboration for documents, spreadsheets, etc.
  • Integrated suite for productivity and communications

Overall, Open365 aims to balance productivity, privacy, and cost for individuals, teams, enterprises, educational institutions, and government agencies looking for an alternative to closed, proprietary office and collaboration platforms.

Official Links

Official Website
github.com/Open365/Open365

The Best Open365 Alternatives

Top Apps like Open365

Apple Mail, Microsoft Office Outlook, Microsoft 365 (Office), Apache OpenOffice, OpenProject, ONLYOFFICE, WPS Office, EssentialPIM, CryptPad, Ultra Office, Pegasus Mail, Graphite Docs, Claws Mail, GMX Online Office, Conholdate.Total for .NET are some alternatives to Open365.
Sugggest an alternative ❐

Apple Mail

Apple Mail, commonly known as Mail, is the default email client pre-installed on Apple devices running macOS and iOS. As a core application within the Apple ecosystem, Mail provides users with a straightforward and integrated email experience, aligning with Apple's emphasis on user-friendly design. Key Features: User-Friendly Interface: Apple...

Microsoft Office Outlook

Microsoft Outlook is a personal information manager software application developed by Microsoft. It is part of the Microsoft Office suite of productivity applications.Outlook offers email, calendar, contacts, tasks, and notes management features. It supports exchanging email, calendar appointments, contacts, tasks, and notes with Microsoft Exchange Server or other services...

Microsoft 365 (Office)

Microsoft 365 (formerly known as Office 365) is a subscription service from Microsoft that provides access to productivity software and other cloud services. The core component of Microsoft 365 is access to desktop applications like Word, Excel, PowerPoint, and Outlook. Unlike traditional one-time purchases of Office suites, a Microsoft 365 subscription allows you to...

Apache OpenOffice

Apache OpenOffice is a full-featured office productivity suite that is open source and available for free. Originally developed as StarOffice in the 1990s, it was acquired and open sourced by Sun Microsystems in 2000 as OpenOffice.org. In 2011, Oracle donated it to the Apache Software Foundation, who released Apache OpenOffice.Apache...

OpenProject

OpenProject is an open-source web-based project management software. It provides organizations with all the tools required for successful project delivery. Some of the key features of OpenProject include:Project planning tools like Gantt charts, roadmaps, task boards, and calendar views to plan projects and tasksTime, cost, and resource reporting to...

ONLYOFFICE

ONLYOFFICE is an open-source office suite developed by Ascensio System SIA. It includes online editors for text documents, spreadsheets, and presentations that allow users to create and edit Office Open XML files (.docx, .xlsx, .pptx) from any browser.Some key features of ONLYOFFICE include:Collaborative editing - multiple users can...

WPS Office

WPS Office is a popular office software suite developed by Kingsoft Corporation in China. It includes a word processor (WPS Writer), spreadsheet program (WPS Spreadsheet), and presentation software (WPS Presentation).As an alternative to Microsoft Office, WPS Office provides similar functionality for documents, spreadsheets, and slideshows. The user interface looks...

EssentialPIM

EssentialPIM is a full-featured personal information manager (PIM) software for Windows designed to help you organize all aspects of your life in one convenient application. With EssentialPIM, you can manage your contacts, calendars, tasks, notes, passwords, and more from a single dashboard-style interface.Key features of EssentialPIM include:Contact Management...

CryptPad

CryptPad is an open-source, zero-knowledge, collaborative online editor that allows real-time document editing and sharing with end-to-end encryption. It was launched in 2016 by XWiki SAS.Some key features of CryptPad include:End-to-end encryption - All data stored and transferred is encrypted client-side using AES-256 encryption. The server never has access...

Ultra Office

Ultra Office is a feature-rich office suite that provides tools for common business and personal productivity needs. At its core, it includes applications for word processing, spreadsheets, presentations, and more.The word processor allows you to create professional documents like reports, letters, and manuals. It has effective formatting options, collaboration...

Pegasus Mail

Pegasus Mail is an email client application for Microsoft Windows that has been around since 1990. It focuses on providing a secure, stable and efficient email experience for home and business users.Some key features and capabilities of Pegasus Mail include:Supports popular email protocols like POP3, IMAP and SMTP along...

Graphite Docs

Graphite Docs is a cloud-based document creation and collaboration software designed for teams. It provides a central location for creating, organizing, sharing, and managing all documentation needs of an organization.With Graphite Docs, teams can collaborate on documents in real-time, with built-in chat and commenting tools that facilitate feedback and...

Claws Mail

Claws Mail is a free, open source email client and news client for Linux and other Unix-like operating systems. It is designed to be lightweight, fast, and easy to use while still being highly customizable and supporting advanced features.Some key features of Claws Mail include:Support for POP3, IMAP...

GMX Online Office

GMX Online Office is a free online office suite offered by GMX, a German web services provider. It includes web-based applications for word processing, spreadsheets, and presentations.The word processing app allows users to create, edit, and format text documents. It has options for changing fonts, colors, paragraph formatting, bullets...

Conholdate.Total for .NET

Conholdate.Total for .NET is a comprehensive .NET library that allows software developers to work with over 100 popular document and image formats in their .NET applications without needing to rely on any third party dependencies. Developed by Aspose, it provides a broad range of features for creating, editing, converting, viewing...