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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.
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Downmixer
Downmixes Surround 5.0 to Stereo 2.0 while keeping the original stream. Can be run recursively and incrementally through a folder.
Remux to MKV
I also use codesandbox to mess around with javascript, specifically things I want to create a tdarr plugin for, so if I have an idea and I need a specific function, I'll write it up in codesandbox to test code for plugin ideas, then I tweak, test and repeat.
BTW, I happen to have code for downmixing that works by appending an audio stream and setting it to first position. I wrote this to use for a single set of files that I ripped from DVD, so I knew exactly what I was working with, but the relevant ffmpeg part should be useuful: