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.
surveyjs.io
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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.
I probably use it 20 times a day and couldn't do my work without it's awesome keyboard-driven annotation tools. Just take a look at at an FAQ page I write for Lunar and you can see it's full of CleanShot annotated screenshots.
A free and open-source alternative (albeit non-native) is Gmail Desktop (https://github.com/timche/gmail-desktop). Great app and can't believe its not mentioned more often!
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.