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

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

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

⭐ Antares Project Application Skeleton. This is the very first place you should start. It allows you to create a brand new awesome project in easy few steps.

2FA Notifier is a web extension that notifies users whether or not the sites they visit support two factor authentication (2FA).

This telegram bot written in Python will help you access the 2FA codes. All your keys for generating 2FA are stored in an encrypted file. Used Fernet symmetric encryption.

Example for implementing two factor authentication in Android using Twilio's Authy API and firebase. | TUTORIAL : https://pragmatictheories.tech/android-implementing-two-step-authentication-through-google-authenticator/

Authentication framework for Elixir

Adding two factor authentication to Meteor.js using the Twilio Authy API.

Sample Code: Aspnet Core 2.0 + Identity + Dapper + 2FA

Terraform utility provider for generating Time-Based One-Time Passwords (TOTPs) ⏰🔑

A convenience tool for the Swivel Authentication API

Authentication plugin with Two-factor authentication.

Two-Factor Authenthication (2FA) for e107

This Python script simulates a two-factor authentication (2FA) system using TOTP (Time-based One-Time Password) and backup codes. It provides functionalities for user registration, login, and validation of TOTP or backup codes.

Google 2FA Java Application

a pratical example using authy to build a 2FA authenticated system in a flask web app

bi-directional 2FA prototype