well I’m guessing this one came from berkeley: https://beej.us/graffiti/archive/berkeley.svg

As for the others, I’ve got no idea.

Why do french people only have one egg for breakfast?

Because one egg is un oeuf.

What’s brown and sounds like a bell?

Dung

yes, and on nebula as well I think

I only checked a few, but there seems to be a mixture of source (mostly .bat, javascript) and binaries. Probably best to not run any of them, unless you’re a retro computing enthusiast with a desire for an authentic limewire experience.