Howtoforge published a guide about installing ONLYOFFICE with Plone CMS.
How to integrate ONLYOFFICE with Plone CMS
ONLYOFFICE Document Server is a free open-source office suite distributed under GNU AGPL v3.0. It comprises online collaborative editors for text documents, spreadsheets, and presentations for integration with multiple cloud storage platforms like Nextcloud, ownCloud, Seafile, HumHub, Alfresco, and many others, or you can integrate the editors into your own web solution. Plone is a free open-source content management system built on top of Zope, family of web application servers written in Python. Distributed under GNU GPL.
How to integrate ONLYOFFICE with Plone CMS
