Useful Google Docs Add-On

Clipboard by Diigo for Google Docs

The Clipboard Add-On by Diigo is useful for writers. The tool streamlines the editing process by providing users with a sidebar clipboard for managing content. The content on the clipboard is accessible from any Google Doc. The tool helps users  collect and manage content, and use it again when needed. Just open an existing Google Doc, clip selected content to save it to your clipboard, then use it again when working in any of your Google Docs. Contents on the clipboard remain there until they are deleted by the owner.