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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.
Some of you may know of the Terp-Course-Helper userscript, which integrates average gpa and planetterp and ratemyprofessor reviews into the schedule of classes. Unfortunately it's been broken and unmaintained for over a year and the author is unresponsive.
So, I've forked it, fixed a bunch of stuff, and added a few features (along with u/minermaniac447), and will be maintaining it for the foreseeable future. Until I graduate really, at which point I'll pass it along to someone else. You can find it here if you want to install it: https://github.com/tybug/testudoplus#installation