The Single Sign-On Multi-Factor portal for web apps, now OpenID Certified™

A Web app to manage your Two-Factor Authentication (2FA) accounts and generate their security codes

List of sites with two factor auth support which includes SMS, email, phone calls, hardware, and software.

**NOT MAINTAINED** Two-factor authentication for Node.js. One-time passcode generator (HOTP/TOTP) with support for Google Authenticator.

One Time Password (OTP) / 2FA for Node.js and Browser - Supports HOTP, TOTP and Google Authenticator

:closed_lock_with_key: multi factor authentication system (2FA, MFA, OTP, FIDO Server)

Extract one time password (OTP) secrets from QR codes exported by two-factor authentication (2FA) apps such as "Google Authenticator". The exported QR codes from authentication apps can be captured by camera, read from images, or read from text files. The secrets can be exported to JSON or CSV, or printed as QR codes to console.

One Time Password (HOTP/TOTP) library for Node.js, Deno, Bun and browsers.

PHP library for Two Factor Authentication (TFA / 2FA)

A Security Framework for Python applications featuring Authorization (rbac permissions and roles), Authentication (2fa totp), Session Management and an extensive Audit Trail

Generate 2FA tokens compatible with Google Authenticator

The best React Native example for phone verification (an alternative to Twitter Digits).

.Net library for Two Factor Authentication (TFA / 2FA)

Two-Factor Authentication for all your users out-of-the-box.

🔑 Second factor TOTP (RFC 6238) provider for Nextcloud

Time-Based One-Time Password Code Generator

A comprehensive Node.js package that simplifies the implementation of One-Time Password (OTP).

🔑 Second factor provider using an external messaging gateway (Signal, SMS, Telegram, WhatsApp and XMPP)

🔑 U2F second factor provider for Nextcloud

Vonage Server SDK for Java. API support for SMS, Messages, Voice, Text-to-Speech, Numbers, Verify (2FA), Video and more.

An async security library for the Sanic framework.

React Native wrapper for Android's SMS User Consent API, ready to use in React Native apps with minimum effort.

TOTP and HOTP Token for Andriod Devices

Apache two-factor (2FA) authentication with Google Authenticator based on Time-based One-Time Password (TOTP) or HMAC-based one-time password (HOTP) Algorithms.

Better authentication for HTTP

Two-factor authentication tray app in macOS

This article will teach you how to secure a React.js app by implementing two-factor authentication (2FA) feature using TOTP tokens generated by Google Authenticator, Authy, or Chrome's Authenticator extension

Nginx SSO middleware for protecting your internets.

This is a build environment to build a docker image for privacyIDEA based on official Python image and PrivacyIDEA.

Firefox addon that generates TOTPs for 2 factor authentication