The Single Sign-On Multi-Factor portal for web apps

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.

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

🔑 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.

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

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

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)

🔑 Second factor TOTP (RFC 6238) provider for Nextcloud

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

Time-Based One-Time Password Code Generator

🔑 U2F second factor provider for Nextcloud

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

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

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