multiOTP open source strong two factor authentication PHP library, OATH certified, with TOTP, HOTP, Mobile-OTP, YubiKey, SMS, QRcode provisioning, etc.

multiOTP Credential Provider is a V2 Credential Provider for Windows 7/8/8.1/10/2012(R2)/2016 with options like RDP only and UPN name support

Add Yubikey U2F authentication to Laravel.

PHP class to authenticate YubiKeys locally (Yubico OTP algorithm), without any dependency (no PEAR, no PECL, no cURL)

SimpleID plugin for Yubikey authentication

PHP class to authenticate YubiKeys on YubiCloud, without any dependency (no PEAR, no PECL, no cURL)

PHP 7/8-friendly alternative to the official php-yubico client

A collection of classes to provide second factor authentication like Yubico OTP (Yubikey), Oath (TOTP, HOTP, GoogleAuthenticator) server-side written in PHP.

WordPress plugin to enable Yubico OTP authentication

A modern PHP library for verifying Yubico One-Time Passwords.