Software-based TOTP/HOTP authenticator for Flipper Zero device.

A secure, easy-to-use TOTP/HOTP client written in C with a GTK4/libadwaita interface.

Experimental Single Sign On server, OAuth2, Openid Connect, multiple factor authentication with, HOTP/TOTP, FIDO2, TLS Certificates, etc. extensible via plugins

Core implementations of an open-source secure key

ESP32 MFA Authenticator

C library that generates TOTP and HOTP

OTP library for C (All MCU)(Pure C)

🔐 Hardware TOTP Authenticator & Password Manager | 8-layer security | AES-256 | BLE Keyboard | Offline | ESP32 T-Display | T-Display S3

A tiny command line utility to generate OTP tokens

rvault: secure and authenticated store for secrets and small documents

Diglol Crypto for Kotlin Multiplatform.

A small C library that implements TOTP, compatible with Google Authenticator

RFC 6238 code generator compatible with Google Authenticator

C implementation of TOTP to generate 2FA code like Google Authentificator.

Firmware for Open Authenticator

Time-based one-time password (TOTP) authentication for Nginx

A homebrew application implementing Time-Based One-Time Password (TOTP) on the PlayStation Portable

simple, standalone TOTP without dependencies

A hardware token that works with the two-factor authentication for GitHub, Google, Facebook, and so on.

Linux PAM module that adds TOTP-based two-factor authentication (2FA) to SSH, sudo, and console login on Ubuntu — compatible with Google Authenticator, Authy, and any RFC 6238 app. No network calls, no third-party servers.