The 1.0 version of HMM is available as a free download on our software library. The following version: 1.0 is the most frequently downloaded one by the program users. The size of the latest setup package available for download is 799 KB. This free program is an intellectual property of CS. The software lies within Multimedia Tools, more precisely General.
From the developer:
This toolbox supports inference and learning for HMM s with discrete outputs (dhmm's), Gaussian outputs (ghmm's), or mixtures of Gaussians output (mhmm's). The Gaussians can be full, diagonal, or spherical (isotropic). It also supports discrete inputs, as in a POMDP. The inference routines support filtering, smoothing, and fixed-lag smoothing.
You may want to check out more software, such as Helium Music Manager, Julius for SAPI or Big Head Zed, which might be similar to HMM.