Observatory by Mozilla is a project designed to help developers, system administrators, and security professionals configure their sites safely and securely.
Scott Helme built securityheaders.io after deploying security headers like CSP and HSTS to his own site. He wanted a quick and easy way to check if other sites were using these headers and he figured he'd turn it into a useful tool for everyone to use!
Nibbler is a free tool for testing websites. Enter the address of any website and Nibbler will give you a report scoring the website out of 10 for key areas, including accessibility, SEO, social media and technology.
LetsValidate is a free tool to analyze websites to find weaknesses related to competition and make a suggestions to improve your website rankings. It also has a module for analysis of technologies used on the website.
GTmetrix is a free tool that analyzes your page's speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.
Although this project is small, openness and inclusivity are taken seriously. To that end the a code of conduct (listed in the contributing guide) has been adopted.