ONLYOFFICE

ONLYOFFICE is an open source office and productivity suite developed by Ascensio System SIA, a company founded in 2009 and headquartered in Riga, Latvia. Originally launched as TeamLab, the project rebranded to ONLYOFFICE in 2014 and has since evolved into one of the most comprehensive open source alternatives to Microsoft Office and Google Workspace. ONLYOFFICE provides a full suite of online editors that achieve high compatibility with Microsoft Office formats (DOCX, XLSX, PPTX), making migration from proprietary office suites straightforward.

The platform includes a document editor, spreadsheet editor, presentation editor, form creator, and PDF editor, all with real-time collaboration capabilities including co-editing, commenting, change tracking, and version history. ONLYOFFICE offers deep integration with popular cloud platforms including Nextcloud, ownCloud, Seafile, and Moodle. The editors support macros, plugins, and an API for extending functionality. ONLYOFFICE also provides end-to-end encryption for documents via its Private Rooms feature, and the self-hosted Workspace edition includes project management, CRM, email, and calendar tools.

ONLYOFFICE is headquartered in Riga, Latvia, a European Union member state, with data center operations in the EU. The editors are open source under the AGPL license, and organizations can deploy ONLYOFFICE on their own infrastructure for complete data sovereignty. With over 50 employees and millions of users worldwide, ONLYOFFICE has become a key building block in the European open source ecosystem. It is particularly popular among organizations that need Microsoft-compatible document editing without relying on US-controlled cloud services, and its integration with Nextcloud has made it a standard component of self-hosted European productivity stacks.