Regex101.com is an interactive regular expression console that lets you debug your expressions in real-time.
Software Testing Tools & Resources
Largest collection of Resources and Tools for Software Testing Community

regular expressions 101

Axe Html Reporter
Creates easy to read HTML file from axe-core accessibility results object

contrast ratio
A tool to calculate the contrast ratio between any two valid CSS colors.

Color Contrast Analyzer
Great tool for checking color contrast for both text and images of text.

Accessibility Insights for Web
Accessibility Insights for Web helps developers quickly find and fix accessibility issues.

Axe Core
Accessibility engine for automated Web UI testing
JMeter DSL
Simple JMeter performance tests API
Semgrep
Static analysis at ludicrous speed.
PasteSafely
A Pastebin alternative