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webmin is the closest thing I've found in the past, but would love to hear of newer options

Well, you can run their os on your hardware or in a virtual machine using https://xpenology.org/

DSM may not still be, but last time I looked it was built using Sencha ExtJS.

I'm not sure when the buyout happened, but a few years ago Sencha became the shadiest, nastiest organisation I've ever dealt with. I'm keen to see what Synology do / have done to displace it.