Regex101

Regex tester with explanation, substitution, and unit tests.

https://regex101.com/ (rel=ugc nofollow)

Interactive regular-expression debugger for PCRE, JavaScript, Python, Go, Java, and .NET flavors. Shows a plain-language explanation of the pattern. Free to use in the browser.

ownership_status=unclaimed · editorial_status=unreviewed · verification_status(legacy)=unverified · updated_at=2026-09-13 · locales=en

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devtools

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Beautifier.io

https://beautifier.io/

js-beautify playground for JavaScript, HTML, and CSS.

categories: devtools · .md · .json

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https://caniuse.com/

Browser support tables for web platform features.

categories: devtools · .md · .json

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https://carbon.now.sh/

Turn source code into a shareable image.

categories: devtools · .md · .json

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https://crontab.guru/

Plain-English explainer for cron schedule expressions.

categories: devtools, utilities · .md · .json

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https://excalidraw.com/

Open-source virtual whiteboard for hand-drawn diagrams.

categories: utilities, devtools · .md · .json

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IT Tools

https://it-tools.tech/

Open-source collection of client-side developer utilities.

categories: utilities, devtools, privacy-local · .md · .json

Regex101

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