-
electron-discord-webapp
A Discord and SpaceBar :electron:-based client implemented without Discord API.
-
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.
Makes me think of the excellent JSLinux by Bellard, https://bellard.org/jslinux/. Runs Linux / Windows 2000 in the browser with internet and file storage. Or another one which can boot a custom iso you provide, http://copy.sh/v86/
If I wanted the full-fat Discord app (rather than a browser website or PWA, or a third-party client Discord will ban you over), I'd look into https://github.com/SpacingBat3/WebCord (which I think isn't detected and banned, but I cannot guarantee this or that they won't rewrite Discord to the point you can get banned for using it).