(Cross-posted on the Google Drive Blog)

You use Google Docs and Sheets to get all sorts of stuff done—whether you're staying up late to finish that final paper or just getting started on a new project at the office. But to help take some of that work off your shoulders, today we're launching add-ons—new tools created by developer partners that give you even more features in your documents and spreadsheets.
To browse through add-ons for Docs and Sheets, select Get add-ons in the Add-ons menu of any open document or spreadsheet. (Add-ons for spreadsheets are only available in the new Google Sheets).
Once you install an add-on it will become available across all of your documents or spreadsheets and you can start using it right away.

Here are just a few examples of how add-ons can help you do more with Docs and Sheets:

Get approvals from Docs and Sheets 
Need to gather approvals or feedback? Letter Feed Workflows routes your document to the right people and adds a simple “Approve” button right inside your document or spreadsheet. You’ll be notified as soon as it’s approved, and can publish the final version with a single click.
Print address labels and name tags 
With Avery Label Merge you can seamlessly import addresses or names from Sheets into Docs for printing. Just pick the type of Avery labels you’ll be printing and your document will be formatted to match the layout of your label pack.
Create a bibliography without leaving Docs 
Citing sources is about to get much easier for the millions of students who use Google Docs to write papers. The EasyBib Bibliography Creator helps you cite books, journals, and websites in MLA, APA, and Chicago style by entering in titles, journal article names, and websites right inside your document.

Send customized emails 
With Merge by Mailchimp you can send customized emails from Google Docs. Use merge tags to pull info from a spreadsheet into your document. Once your data is merged, hit send and your personalized emails will be delivered.

These are just some of the many add-ons that are available for you to use right now in the Docs or Sheets add-on stores, with lots more on the way.