For the desktop maybe Haiku and Plan9 as well. I don’t know if those would be more or less popular than Minix and Solaris though.

They can see what website you go to, and how much data you exchange with it, but not what specific page on that site you’re looking at or what specific data you send (for example my ISP can’t tell that I’m making this specific comment).

Provided the site is using SSL of course.