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

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++?

Solution

Name             Released     Downloads in 2011

CRFSuite 0.12    2011-08      ~800

CRF++ 0.54       2010-05      ~11000

FlexCRFs 0.3     2007-04      ~800

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