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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.
Most of the work of good public consultation facilitators is (1) stopping those loud/frustrated/opinionated/entrenched people from distorting process, and (2) allowing some people to be heard.
Perhaps surprisingly with (2), public consultations are sometimes almost like public therapy -- allowing people to feel heard so they can then take a step forward, even if it's not a step fully in the direction they prefer. People can make better compromises when they feel heard, they just need to be contained so they don't take speaking time/attention from everyone else.
Disclaimer: highly involved in public consultation, tech, and consensus-building technology through my interest in https://github.com/compdemocracy/polis