Onlyoffice team made a plugin for Confluence users which allows them to edit text documents, spreadsheets and presentations, document co-authoring included.
(https://api.onlyoffice.com/editors/confluence)
The legal terms for listing a plugin in Atlassian Marketplace are covered in the Atlassian Marketplace Vendor Agreement:
https://www.atlassian.com/licensing/marketplace/publisheragreement
If you have specific questions about listing your plugin, feel free to contact the Marketplace support team:
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.