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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.
I started a JS based file sharing application a few years back. It started as a thought experiment of just exposing the file system to the browser in a familiar OS kind of user interface. As new features are added over time it has become more like a high level OS.
https://github.com/prettydiff/share-file-systems
Some architectural decisions I made:
* Micro-service based
* I am now using WebSockets for all services and communication. That has proven in the application to be 7x faster than HTTP.
* I have a universal format wrapping all service messaging, kind of like sending a letter in an envelope. This allows me to using a single service end point for all services and a single means of service monitoring.
* I did not like the existing test automation solutions based upon CDP, because they are too slow and fragile. Also, they do not provide support for a peer-to-peer experience. So I wrote my own test automation solution for testing in the browser and its much faster and predictable.
* I am using an identity based authentication mechanism to restrict access to known users/devices.
* I just write to the file system instead of using a database for data storage. This allows for much faster application start up times and lowers complexity. The performance difference is insignificant after accounting for that in most cases opening a file is more costly than arbitrarily writing to the file system.
* I figured out how to install certificates using automation in both Windows and Linux which allows me to run the application using encrypted transmission protocols (https/wss) on localhost.