Google Drive Add-ons allow users to add functionality to Google Documents. There are many great add-ons for Forms, Docs, and Sheets.
Google Drive Add-on Tutorial
in Google Docs have improved greatly since Docs first rolled out, they are still somewhat limited. Table Formatter allows users to use many of the MS Word table features in Docs. Users can customize styles and backgrounds and even create their own templates. If you are using Google Docs and are looking for more table formatting options, this could be a great resource.