Competitor website technologies research
WhatCMS – It’s a tools to detect which CMS your competitor are using
Whatruns – It’s a chrome extensions to that helps you to identify technologies used on your competitor website.
Wappalyzer – This is a tool to find out what kind of technology your competitor website uses.
BuiltWith – The most powerful tool website technology profiler, it’s not only helps you to detect what technology currently used by your competitors, it also stored the technology they used previously.