Today Google is 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. 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. Note that add-ons for spreadsheets are only available in the new Google Sheets.
Google Apps admins must enable add-ons through Drive settings in the Admin console. Users will always see the Add-ons menu and can browse them but will not be able to install them if the feature isn’t enabled by the admin.
For more information:
https://support.google.com/a/
http://googleenterprise.
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