This is Google Docs Plugin - version for Google Apps for Business.
Based on great work described here: evolvingweb.ca/story/introducing-redmine-google-docs-plugin
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Extract/clone to the vendor/plugins folder of your Redmine installation.
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Enjoy
{{google(full_link_to_your_company_doc_or_spreadsheet)}}
It uses Google auth mechanism to let Redmine user view or edit content, no need to specify readonly or edit mode.