Tools for evaluation, fusion and calibration of two-class statistical pattern recognizers.
The original website is at www.dsp.sun.ac.za/~nbrummer/focal. In case that site is unavailable, the contents of those pages are available here: https://sites.google.com/site/nikobrummer/focal_webpage.zip. Alternatively, you could also try the newer and more powerful Bosaris Toolkit.
Also see:
Multi-class tools at: FoCal Multiclass.
Bilinear fusion for two-class, to incorporate side-info: FoCal Bilinear.