two-factor

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

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

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

**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

🔐 multi factor authentication system (2FA, MFA, OTP 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).

🔑 U2F second factor provider for Nextcloud

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

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