Trustworthy, encrypted, command-line TOTP/HOTP authenticator app with import functionality.

Time-Based One-Time Password (TOTP) and HMAC-Based One-Time Password (HOTP) library for Go.

A time-base one time password generator for Mac (TOTP)

Generate TOTP secrets and codes to use while making and testing software secured by TOTP MFA/2FA.

jCat One Time Password Manager

Operation system for boards. The Operating System allows you to use the board as a security key.

Alternative security options

Web-App to share TOTP with a group of people.

Time based OTP (TOTP) generation for 2-factor authentication like Google Authenticator without backend

JS/HTML UI widget for entering OTP tokens of varying length (e.g. TOTP, SMS), auto-progression, fires custom event etc. Plain javascript.

Cross-platform desktop application for generating TOTP codes

Command line Google Authenticator alternative. Or, Command line Script for managing 2FAs.

A TOTP code generator for the CLI that securely stores secrets in the keychain

Two factor authentication desktop client (JavaFX-based)

An OTP Manager Like PassMenu But For TOTP codes.

hash and encryption library to manage configuration complexity

Python script to dump 2fa pin from Android FreeOTPPlus (FreeOTP+) export file freeotp-backup.json

Implementation of HOTP and TOTP as per the RFC RFC4226 and RFC6238 respectively

A browser based TOTP client.

web service and api with free phone numbers from various providers in one place