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LibreOffice
Read-only LibreOffice core repo - no pull request (use gerrit instead https://gerrit.libreoffice.org/) - don't download zip, use https://dev-www.libreoffice.org/bundles/ instead (by LibreOffice)
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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.
Or use VSCodium, a FOSS distribution of VS code without the tracking
See https://github.com/microsoft/vscode/wiki/Differences-between-the-repository-and-Visual-Studio-Code Telemetry and using the Microsoft extension registry is normally only on the Microsoft official release while the open-source Code and vscodium use Open VSX registry.