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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.
Oh it has its uses – but I think saying "that use is very minimal" misses the point. That is the selling point, in my opinion. It's really sad, but initiative is really not valued in (at least the British system of) education to a great extent, so it sort of fits into an educational process where people are expected to just do as they're told (repl.it is effectively a way of telling them to do what they're told, just in a way that's perhaps less immediately obvious).
This is just mass spamming open source maintainers and people with random open source repositories. Take a look at some of the PRs they link. Most get closed like this one.
It took 2 years of work to get something working and in 2011 we launched on HN (2011 web archive snapshot here https://web.archive.org/web/20111007050930/http://repl.it/ and HN launch here https://news.ycombinator.com/item?id=3056490). It was the first of its kind and it inspired a lot of projects and still does today. It was totally open-source (https://github.com/replit-archive/repl.it) and after the launch it was used as infrastructure by Codecademy (which later employed me) and Udacity and many others to deliver interactive coding in the browser. I was thrilled about that.
You can also check out https://github.com/cdr/code-server if you want the editor to be server-side entirely.
The project start date can be found at https://intuitiveexplanations.com/tech/replit/#what-was-my-open-source-project: 2020-06-05 df9ba38 Initial commit
You said the spat was about him "allegedly open sourcing their project". How could he do that when it was already open source (at https://github.com/replit/polygott)?