Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Reddit List - Tracking the top 5000 subreddits
BuiltWith - Find out the technology behind websites
Upvoted - A news publication by reddit
WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.
Mailbrew - Automated email digests from Twitter, Reddit, YouTube & more