Google has announced new add-ons for Google Docs and Sheets — tools to help you do more in your documents and spreadsheets. For example, you can now print address labels with the Avery Label Merge add-on or create customised mailing list emails with Merge by Mailchimp.
The add-ons are available in the new Add-ons menu within Docs or Sheets. There are quite a few already available for creating mind maps, sending faxes and document signing. Time will tell whether this makes Docs and Sheets more versatile, though Google isn't the first company to try this approach — Microsoft Office also has a long-established program for developing add-ons.
Bring a little something extra to Docs and Sheets with add-ons [Google Drive Blog]