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steam-game-finder
Discontinued Steam : Game Finder is a small app/browser extension allowing a group of Steam users to find out which games they have in common, and who is left out; as well as filtering their shared libraries content to find what to play next.
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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.
The project is currently hosted on github, where you can find direct links to different browser extension versions (Firefox is up-to-date, Chrome & Edge are a bit behind, still under review at the time of writing). You can also use the web app but it has less features (slow server, can't access private profiles and things like that)