Or bots. When I still cared about visitor statistics 10+ years ago, I saw unrealistic amounts of visitors using old versions of Netscape, browsers on Amiga and other niche systems. They were probably all bots in disguise.

and 2039 are on "whatever you want". That's kind of browser I want to use.

Last week, one of those was me. I was messing with old VM images and was using .gov web sites for testing connectivity.

>Why are there (personal?) email addresses in there as well? Who sets that as their user agent?

Might be some programming exercise. It's a common network programming exercise to build a HTTP client using bare sockets. But they don't look like student email addresses.

Some APIs require contact info in the user agent header. For example, all calls to the reddit API are supposed to contain the dev’s reddit /u/username in the user agent.

I think for respectful web scraping it is common/preferred etiquette to include some contact info.