yubikey-agent is a seamless ssh-agent for YubiKeys.
Written in pure Go, it's based on github.com/go-piv/piv-go and golang.org/x/crypto/ssh.
Source code at: https://github.com/FiloSottile/yubikey-agent
License: BSD 3-Clause see https://github.com/FiloSottile/yubikey-agent/blob/master/LICENSE
Copyright: Copyright 2020 Google LLC