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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.
No Mac version yet it looks like.
For anyone interested in a really nice Mac client for Mastodon, the best one I've found so far is this specific fork of Mastonaut https://github.com/chucker/Mastonaut (the original is unmaintained).
The UX is similar to Twitterrific.
> the current list of Mastodon servers feels very limited
Try this site: https://instances.social/
It helped me find some instances that matched my interests. Just keep in mind, most instances will die out if they're not sufficiently funded either by donations or the pocket money of the owners. This is why I treat all my Mastodon accounts as potentially ephemeral accounts that will die out given enough time. The more popular instances seem to be in it for the long haul, so go with those (as much as you enjoy the smaller instances).