Stars
Pluggable Authentication Module (PAM) for U2F and FIDO2
GnuPG asymmetric secrets manager - works with YubiKey!
Tutorial: Writing a "bare metal" operating system for Raspberry Pi 4
A fast, highly extensible, and event driven SMTP server
Community guide to securing and improving privacy on macOS.
Community guide to using YubiKey for GnuPG and SSH - protect secrets with hardware crypto.