ONLYOFFICE Docs is an open-source office suite that offers lightweight browser-based editors for text documents, spreadsheets, presentations, forms, and PDFs. It supports various file formats and allows for complex editing with multiple styling and formatting tools. It also offers collaborative features such as real-time co-editing, track changes, comments and mentions, built-in chat, audio and video calls, and version history. It can be integrated and used within various cloud storage platforms and can be embedded into a solution or used as part of ONLYOFFICE Workspace.