Open-source Microsoft Word alternatives

Univer is an open-source SDK that lets you build office-style applications within your own product. It provides components for spreadsheet, document and presentation features, with no requirement to use a hosted app or a fixed interface. The architecture is plugin-based, with rendering on Canvas, a built-in formula engine and a single Facade API usable in browsers and on Node.js. It is written in TypeScript and released under the Apache-2.0 license.

Typical uses include adding spreadsheet or document editing to a SaaS product, an internal tool, a business intelligence workflow or an AI application, and running workbook or document processing on the server with the same architecture as in the browser. Plugins let you include just the capabilities you want, and presets offer a fast way to get going, and extend behavior with custom plugins, commands, services and UI components. The wider Univer family also covers bases, boards and PDFs, and Univer Workspace, a workspace you can host yourself, is built on the SDK as an open-source example. The README distinguishes the open-source scope from the Pro offering.

Etherpad is a collaborative editor in which several people write in the same document at the same moment. It attributes every keystroke to its author using color highlighting, preserves every revision, and provides a timeslider that lets you replay a document's whole history character by character.

It is built to run on your own server under your own governance, with no telemetry and no upsells, and the project documents the two optional network calls its own code makes and how to turn them off. AI is treated as a plugin that you install and point at a model you choose, running on infrastructure you control. The project says it scales to thousands of simultaneous editors on a single pad, is translated into 105 languages and is extended by hundreds of plugins. Topics mention PDF generation and rich-text editing.

Etherpad is written in TypeScript and licensed under Apache-2.0, and its data format is open. It is used by governments, public institutions, newsrooms and communities that need a simple, trustworthy shared writing space, from meeting notes to collaborative drafting.

Overleaf is an online editor for writing LaTeX documents together in real time. Several people can work on the same project in a browser, which removes the need to install a TeX distribution on every machine. The Community Edition is open source and licensed under AGPL-3.0.

The vendor runs a hosted version at overleaf.com, and the Community Edition can also be run locally using the Overleaf Toolkit and its Docker images. The project cautions that Community Edition is meant for environments where all users are trusted, because without Sandboxed Compiles users get broad access to the container's resources during LaTeX compiles.

For organizations that want help installing and maintaining it, Overleaf offers a commercially supported version called Server Pro. It adds security features such as SSO with LDAP or SAML, administration options and collaboration features including tracked changes. Release updates are announced through a mailing list and the wiki release notes.

Docs, from the La Suite initiative, is an open-source collaborative text editor presented as an alternative to Notion and Google Docs. It is built for real-time collaboration, cleanly structured documents with sub-documents, knowledge organization and full ownership of your data, and it targets public organizations, companies and open communities.

Writing features include rich-text and Markdown editing, slash commands and a block system, offline editing, and optional AI helpers to rewrite, summarize, translate or fix typos. Collaboration covers live cursors and presence, comments and sharing with granular access control. Knowledge management relies on subpages, hierarchy and search. Documents can also be turned into presentations using simple delimiters, with a full-screen mode, PDF export and keyboard navigation. Import and export options are provided.

The back end is built with Django and the front end with React, using collaborative-editing tooling such as Yjs and BlockNote according to its topics. Docs is MIT licensed, can be self-hosted, and has a hosted instance you can try. It suits teams in government and enterprises that need sovereign, self-controlled documentation tools.

LibreOffice is a free office suite whose licenses are copyleft, built to open and save most common document formats and standards. It is free to download, use and distribute, and it is backed by The Document Foundation, which represents an independent community of enterprises, developers and other volunteers.

This GitHub repository is a read-only mirror of the core code: pull requests are not accepted, contributions go through Gerrit, and downloading a zip is discouraged in favor of the project's source bundles. Developers can add features by working on the code base in C++, or write extensions using the SDK and UNO APIs, which are also used by macro scripting in StarBasic.

The README documents the minimum build and runtime baselines for Windows, macOS and Linux, plus iOS for LibreOfficeKit and Android builds. As is widely known, the suite includes applications for word processing, spreadsheets, presentations, drawing and databases. Its code is written mostly in C++.

ONLYOFFICE Docs, published in this repository as the document server, is an online office suite that bundles viewers and editors for text documents, spreadsheets, presentations, forms and PDF files. It is built around Office Open XML formats such as docx, xlsx and pptx, and it supports collaborative editing in real time. The server component runs on Node.js and is licensed under AGPL-3.0.

The vendor's site describes several ways to use it. Docs can be connected to other platforms for in-place editing, with ready integrations for products such as Box, Moodle, Nextcloud, Odoo and WordPress. It can be embedded in your own service under your own brand, and it powers the vendor's DocSpace, where you create rooms and invite people to work on documents. A demo lets you try editing and form filling without registration.

Free desktop apps for Windows, Linux and macOS and mobile apps for iOS and Android are offered for working with documents offline or on the go. The site also offers templates for forms, text documents, spreadsheets and presentations, and converters between formats. Commercial plans and pricing are published by the vendor.