[_emacsomancer_]

I'm pretty sure it's an add-on repo to Ubuntu which contains customisation of GNOME Shell and some System76-specific firmware stuff. (I have a System76 desktop from a few years back, but haven't run Ubuntu or System76's custom repo for some time on it, so I'm not 100% certain.)

[Fomite]

Yeah, as far as I can tell, that's what it seems to be. But there's some breathless hype stuff about it that's obfuscating stuff on their site even though I'm their target audience.