Most of us with fingerprint readers and such devices probably use the software provided by the vendor, to enable biometric OS login or single sign-on functionality. However, I've recently wondered if there is any third-party software that will do the same thing.
This would be similar to how you don't need the manufacturer's software to use a scanner, printer, or webcam - you just use their drivers and your choice of software. Is there anything like this for fingerprint readers or other biometric devices?
Additional info from merged question: Many fingerprint readers and other biometric authentication devices come with software for single-factor authentication to the OS. Is there any third-party software (F/OSS or otherwise) available for making OS authentication a two-factor process, such as by requiring both a fingerprint and a passcode?
Free or Open Source projects are preferred, but I'd be interested in learning about any existing solutions regardless. I personally am particularly interested in Windows-compatible software, but I'll leave the query open for any OS.