Our great sponsors
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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.
Square’s past CTFs puzzles are all available as Docker images. I believe all the puzzles have published solutions.
Start here: https://squarectf.com/
If you want to submit fixes to the above site ping me or open a PR here: https://github.com/square/squarectf
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.