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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.
An in-house engine written in Typescript and WebGL for rendering. ImpactJS will not be used because a) it is old and written for times when JS didn't have a syntax for classes (which makes integration of it with Typescript... tricky to say the least, I've done it); b) was written before WebGL was in wide use and thus doesn't use it itself; c) is roughly 0.001% of the CrossCode codebase anyway, the stock """"""engine"""""" itself (which you can see on Github) is just a few thousand lines of code (very short for a game engine). They may have recycled the codebase of Weltmeister for the next project in some capacity, but then again, WM was originally written in pure JS, so it may very well be that the name is the only major part of it left. They will continue using nwjs though, that's for sure (i.e. not Electron).