Conditional Random Field (CRF) Toolbox for Matlab

Conditional Random Field (CRF) Toolbox for Matlab

1D chains

Matlab/C code by Mark Schmidt and Kevin Swersky
Java code by Sunita Sarawagi
C++ code by Taku Kudo

General graphs

Mark Schmidt has a general-purpose Matlab toolkit for undirected graphical models, conditional and unconditional, available here.

Other resources for CRFs

Introduction to CRFs, Sutton and McCallum, 2006 to appear.
Conditional Random Fields Webpage by Hanna Wallach, good resource with links to papers and other software.