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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.
One thing to do, especially if it is your first contribution to open source, is to find some projects. In my opinion, it is great to choose some technologies and software you use every day. An example for me is my password manager, Buttercup (buttercup.pw). I love to contribute to it because it is helpful for the community. Moreover, it is a satisfaction to see and use my updates in the product. So, the first thing to do is to list some projects you like, for example: