C语言版：
1、 HTK（Hidden Markov Model Toolkit）：
HTK是英国剑桥大学开发的一套基于C语言的隐马尔科夫模型工具箱，主要应用于语音识别、语音合成的研究，也被用在其他领域，如字符识别和DNA排序等。HTK是重量级的HMM版本。
HTK主页：http://htk.eng.cam.ac.uk/
HTK主页：http://htk.eng.cam.ac.uk/
2、 GHMM Library：
The General Hidden Markov Model library (GHMM) is a freely available LGPL-ed C library implementing efficient data structures and algorithms for basic and extended HMMs.
GHMM主页：http://www.ghmm.org/
3、 UMDHMM（Hidden Markov Model Toolkit）：
Hidden Markov Model (HMM) Software: Implementation of Forward-Backward, Viterbi, and Baum-Welch algorithms.
这款属于轻量级的C语言HMM版本。
C++版：
以上两个是C++版本的，但是实现的是离散型的HMM。
Java版：
Jahmm Java Library (general-purpose Java library)：
Jahmm (pronounced “jam”), is a Java implementation of Hidden Markov Model (HMM) related algorithms. It’s been designed to be easy to use (e.g. simple things are simple to program) and general purpose.
Jahmm主页：http://code.google.com/p/jahmm/
Python版：
Malab版：
Hidden Markov Model (HMM) Toolbox for Matlab：
This toolbox supports inference and learning for HMMs with discrete outputs (dhmm’s), Gaussian outputs (ghmm’s), or mixtures of Gaussians output (mhmm’s).
Matlab-HMM主页：http://www.cs.ubc.ca/~murphyk/Software/HMM/hmm.html
Common Lisp版：
CL-HMM Library (HMM Library for Common Lisp)：
Simple Hidden Markov Model library for ANSI Common Lisp. Main structures and basic algorithms implemented. Performance speed comparable to C code. It’s licensed under LGPL.
Haskell版：
The hmm package （A Haskell library for working with Hidden Markov Models）：
A simple library for working with Hidden Markov Models. Should be usable even by people who are not familiar with HMMs. Includes implementations of Viterbi’s algorithm and the forward algorithm.
Haskell-HMM主页：http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hmm
注：Haskell是一种纯函数式编程语言，它的命名源自美国数学家Haskell Brooks Curry，他在数学逻辑方面上的工作使得函数式编程语言有了广泛的基础。
A simple library for working with Hidden Markov Models. Should be usable even by people who are not familiar with HMMs. Includes implementations of Viterbi’s algorithm and the forward algorithm.
Haskell-HMM主页：http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hmm
注：Haskell是一种纯函数式编程语言，它的命名源自美国数学家Haskell Brooks Curry，他在数学逻辑方面上的工作使得函数式编程语言有了广泛的基础。
CDHMM C++版：
注：这是网上找的，里面实现有个连续的HMM-GMM的实现，代码写的很好，有些地方需要根据自己的需求改动。
