What is the de-facto supported Conditional Random Fields package for C++?

Question

The few packages I've found haven't been updated in over a year. I was wondering what the standard CRF package was for C++?

Answer 1

Name             Released     Downloads in 2011

CRFSuite 0.12    2011-08      ~800

CRF++ 0.54       2010-05      ~11000

FlexCRFs 0.3     2007-04      ~800

Answer 2

For linear chains CRF I would recommend crfsuite or wapiti. Both are in C hence usable from C++. Both are very fast and well maintained.