Security is such an important matter in today's digital space. We created a HMAC-based one-time password security token. The program is based on C, and can be used in either hardware or software appliances. It doesn't require the Internet to function as well.
Widely used in online banking and high-security institutions, we are currently using this to guard our panels for accessing our customer information and data.
We are currently working on a mass-producible hardware device that comes pre-installed with our security token.
The closest alternative is the TOTP, which is a one-time password based on time rather than HMAC. Other alternatives include biometric sensors and regular passwords.