OATH Toolkit attempts to collect several tools that are useful when deploying technologies related to OATH, such as HOTP one-time passwords. It is a fork of the earlier HOTP Toolkit.
You can download it from the following link: https://packetstormsecurity.com/files/download/161052/oath-toolkit-2.6.6.tar.gz
Source: https://packetstormsecurity.com/files/161052/OATH-Toolkit-2.6.6.html