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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.
Habitica creator here, randomly popping in. The Warrior set is the OG - it comes from Mozilla's BrowserQuest. When I started the Kickstarter, I had a bright-idea for programming and no art talent. I asked that team personally if I could use their assets, which are Creative Commons (their codebase open source). The project was to showcase the capabilities of JavaScript for game dev (this was around the death of Flash, think RuneScape). They said yes, generous as that foundation is.