yess enables splitting secrets into shares using a Yubikey-based threshold schema

library and cli tool for signing verifiable presentation using yubikey

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

YubiSigner provides a convenient way to sign and securely verify file signatures with Yubico YubiKey, utilizing an organization's PKI infrastructure.

privage is a terminal based password manager and general file encryption tool

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

Keys and certificates for YubiKeys, written in Go