"RTF/ODF-Scan for Zotero is an add-on for the Zotero reference manager software that allows users to insert citation markers into any document saved as .odt (e.g. by software such as google docs or Scrivener) and then convert those into active Zotero citations. It requires Zotero, LibreOffice and the Zotero LibreOffice plugin.
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"There's lots of citation management tools out there, but one of the primary reasons I recommend the free and open-source Zotero tool from CHNM is its automatic syncing service, and ability to share sources - with PDF attachments - in a group library, such as a class or research team. Here's a quick tutorial, and see additional details on the Zotero support page."