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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.
You can see the source code on github https://github.com/votingworks/vxsuite
Looks to be TypeScript running on node. They have an embedded kiosk browser.
This appears to be the code repo- https://github.com/votingworks/vxsuite-complete-system
But it does not have a license file or any license headers... meaning it may not be under an Open Source license at all?
Some of their code- the audit program, looks like it is AGPLv3... which seems like an odd choice of license for this sort of system. Still happy to see more work on Open Source voting systems.