Google Labs- "Google described Google Labs as "a playground where our more adventurous users can play around with prototypes of some of our wild and crazy ideas and offer feedback directly to the engineers who developed them."
Google Add-ons-"Add-ons in Google Docs are tools built by third-party developers using Google Apps Script. If enabled in your organization, users can install add-ons to add more functionality to Google Docs and the new version of Sheets. Examples of add-ons could include a document approval system, digital signature app, mail-merge app, or a suite of custom financial functions for spreadsheets."
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