BuiltWith - Find out the technology behind websites

DevScreen - Automated, practical interview assessments for developers

Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.

Discover by Revue - A directory of personal newsletters

WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.

Daily Time Tracking - Daily shows what you have been working on and for how long. It creates accurate timesheets by asking what you are doing, so no more timers or switching tasks. Use its data to submit your hours, create invoices or simply increase your productivity.