Open Source Software
We offer our software as open source to help the YubiKey community develop compelling applications
Web API Clients
Implementations of web service API for authentication to the YubiCloud or to implement your own validation server.
Validation Server
Resources to allow users to host their own YubiKey validation server.
Low-Level Library
Free software libraries for the decryption and parsing of YubiKey One-Time Passwords.
Personalization Libraries
Libraries for the development and programming of YubiKeys.
ModHex Calculator
The ModHex Calculator converts values between different data encoding formats.
Source Code
Yubico's published projects on GitHub. Please note that not all projects are available via GitHub