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CyberChef
The Cyber Swiss Army Knife - a web app for encryption, encoding, compression and data analysis
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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winget-cli
WinGet is the Windows Package Manager. This project includes a CLI (Command Line Interface), PowerShell modules, and a COM (Component Object Model) API (Application Programming Interface).
This looks like an offline version of CyberChef. Handy!
For Linux there's Text Pieces which does a similar job. Idk about Mac but I'd expect some similar tool to exist too.