The Daily Shaarli

REDbot is lint for HTTP resources; it tests protocol correctness, cacheability, content negotiation and more. REDbot checks HTTP resources to see how they'll behave, pointing out common problems and suggesting improvements. Although it is not a HTTP conformance tester, it can find a number of HTTP-related issues.

Wappalyzer is a cross-platform utility that uncovers the technologies used on websites. It detects content management systems, ecommerce platforms, web frameworks, server software, analytics tools and many more.

Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication. It has audits for performance, accessibility, progressive web apps, SEO and more.

Report URI was founded to take the pain out of monitoring security policies like CSP and HPKP. When you can easily monitor what's happening on your site in real time you react faster and more efficiently, allowing you to rectify issues without your users ever having to tell you.

A free analysis tool to check if a website is disguising third-party trackers as first-party trackers.