Sinsy is an HMM-based singing voice synthesis system. This software is released under the Modified BSD license.
Sinsy is a great project with a great futur. Hope the source code will be updated soon with latest version (english version) working on the webserver. Currently only the japanese version is available for public. The Sinsy is one of the excellent project of the toolkit provided by the author. Source code is clean and easily understandable. A lack of english paper about sinsy is the only problem for a easiest approach of this project.
I have tried to install it; first, gcc could not create executables, then I had to install build-essentials, after that HTS_engine.h was missing, and after I installed it, it still said during compiling that HTS_engine.h was missing.