A Pageant -> TCP bridge for use with WSL, allowing for Pageant to be used as an ssh-ageant within the WSL environment.

Hardware-based SSH/GPG/age agent

yubikey-agent is a seamless ssh-agent for YubiKeys.

Test ssh login key acceptance without having the private key

Store SSH keys in the Secure Enclave

wolfSSH is a small, fast, portable SSH implementation, including support for SCP and SFTP.

Win32 port of OpenSSH

SSH server & client security auditing (banner, key exchange, encryption, mac, compression, compatibility, security, etc)

Use Touch ID / Secure Enclave for SSH Authentication!

Database of private SSL/SSH keys for embedded devices

An SSH agent for hardware backed keys on Windows

An SSH and GPG agent which you can use with your PIV hardware security device (e.g. a Yubikey).

Guide to using YubiKey for GnuPG and SSH