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Google has added an Add-on Store in a similar fashion to an app store, but it applies to their Google Docs and Google Sheets web office programs. It debuted with 30 apps, ranging from templates to bibliographies, and more. They have also opened up this store for third-party development so these programs could see add-ons that give these programs similar functionality to the Microsoft equivalent.
For more check it out:
http://www.theverge.com/2014/3/11/5496662/google-launches-add-on-store-for-docs-and-sheets
For more check it out:
http://www.theverge.com/2014/3/11/5496662/google-launches-add-on-store-for-docs-and-sheets