Apereo CAS - Enterprise Single Sign On for all earthlings and beyond.

An example Java Relying Party implementation of the WebAuthn specification

An implementation of the FIDO U2F server protocol in PHP

A server-side U2F (Universal Second Factor) library in Elixir

FIDO/FIDO2 Universal 2 Factors (U2F) support for PHP

Simple erlang implementation of the server side of the Universal 2nd Factor (U2F) open authentication standard

U2F Server

Symfony Bundle for FIDO U2F Support

U2F library in PHP

Node.js API to register and verify a U2F key (by Yubico)