Questions about developing using the ONLYOFFICE office and productivity suite API and Document Builder. Questions about installing, hosting, or using ONLYOFFICE do not belong here - consider: https://support.onlyoffice.com/ https://cloud.onlyoffice.org/ https://dev.onlyoffice.org/ https://superuser.com/ https://serverfault.com/
ONLYOFFICE is an open-source office and productivity suite, including CRM and project management functions, as well as document editing, document management, calendaring and mail.
The is an Enterprise Edition and Community Edition. These can be installed using Docker on Linux or on Windows or you can use their cloud version.
There is an API available for interacting with ONLYOFFICE, and in particular, a DocumentBuilder API for creating and editing OOXML documents programmatically.
Questions about installing, hosting, or using ONLYOFFICE do not belong here, consider the forums below or Superuser/Serverfault.
Useful links: