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Pizzly
Discontinued The simplest, fastest way to integrate your app with an OAuth API [Moved to: https://github.com/NangoHQ/nango]
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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.
For those of you new to Pizzly: Pizzly is an open-source library that makes building on APIs with OAuth fast & simple. It handles the OAuth 2 and 1.0a dance for you, gets you an access token, keeps it fresh and makes it fast and easy to do authenticated API calls. It is language agnostic and supports 50+ APIs out of the box.