Lumin PDF for G Suite - Open, edit and share PDF and Office files in your browser.
BuiltWith - Find out the technology behind websites
DocuSign - Try DocuSign's interactive signing demo now! Send yourself an electronic document to digitally sign using our e-signature service.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
GTasks for G Suite - Lets you to manage your Google Tasks from Docs allowing you to tackle your to-do list.
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.