Moodle Plugins directory: Set: Collabora | Moodle.org
Collabora 
Collabora Online is a powerful LibreOffice-based online office that supports all major document, spreadsheet and presentation file formats, which you can integrate in your own infrastructure. Key features are collaborative editing and excellent office file format support.
mod_collabora
This activity module provides a document editor for real-time collaboration. Changes to a document are immediately reflected for other users who are accessing the same document. Moodle users can collaborate on simple text files, word, spreadsheet and presentation documents or upload a document.
The plugin requires a self-hosted Collabora Online Server (CODE) that is accessed using the so-called WOPI protocol.
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