ONLYOFFICE is an open-source office suite that supports various formats, including MS Office files. It allows users to create and edit documents, spreadsheets, presentations, forms, and PDFs online. It also offers Diagram Viewer to view and navigate Microsoft Visio diagrams. The suite supports plugins for translation, bibliography generation, thesaurus search, and video insertion. The AI assistant available via the AI plugin allows connecting to various AI models such as ChatGPT, DeepSeek, Claude, Google Gemini, and others. It can help generate, improve, or analyze text, translate content, find keywords, explain terms, summarize or rewrite selected fragments, and recognize text from images (OCR). The plugin also supports image generation and can assist with creating spreadsheet formulas and macros. The software offers collaboration features such as co-editing, comments, Track Changes, document version history, and file comparison. It ensures data security with encryption, HTTPS, JWT, and limited cache lifetime. ONLYOFFICE can be integrated into platforms like Nextcloud, ownCloud, Jira, Redmine, Moodle, WordPress, Drupal, and more. It also allows creating new apps using Open API. It is available in Community, Enterprise, and Home Server editions, with the Developer Edition adding document editing and collaboration functionality. Free desktop apps are compatible with Windows, Linux, and macOS. Mobile editors are also available for iOS and Android. ONLYOFFICE DocSpace combines Docs with a collaboration platform, a room-based space for document storage and coediting. It can be used as a cloud service or a self-hosted solution.