- CRFSharp Linear-chain CRFs (C#, .NET)
- GCO CRFs with submodular energy functions
(C++, Matlab) - GRMM General CRFs (Java)
- CRFall General CRFs
(Matlab) - Sarawagi's CRF Linear-chain CRFs (Java)
- HCRF library Hidden-state CRFs (C++, Matlab)
- Wapiti Fast linear-chain CRFs (C)[7]
- CRFSuite Fast restricted linear-chain
CRFs (C) - CRF++ Linear-chain CRFs (C++)
- FlexCRFs First-order and second-order
Markov CRFs (C++) - crf-chain1 First-order,
linear-chain CRFs (Haskell)
This is a partial list of software that implement CRF related tools.