Hacker News Reader

You need an e-mail for GitHub as well, but in addition a GitHub account

You don't need an account to read the list.

http://vger.kernel.org/vger-lists.html

Unless you count your ISP of course.

You don't need an account to browse GitHub PRs or issues either.

You don't need an account to send email. You can send emails using nothing but a CLI tool on a *nix machine. Although most mainstream email services will send those to the spam folder these days.

I thought damn near every ISP blocks port 25 outgoing. I even had to open a ticket to get it unblocked on a vps I use.

probably for the best.