Kotlin Multiplatform implementation of One Time Passwords Manager that compiles to native code on all platforms from single codebase

OTPLib Delphi Library

Authenticator – scans QR codes, generates time-based OTPs using HMAC, auto-refreshes on expiry, supports account deletion, and works fully offline

A lightweight, zero-dependency Node.js library for generating and verifying Time-Based One-Time Passwords (TOTP) and HMAC-Based One-Time Passwords (HOTP), compliant with RFC 6238 and RFC 4226.