Festvox
The Festvox project aims to make the building of new synthetic voices more systematic and better documented, making it possible for anyone to build a new voice. It is distributed under a free software license similar to the MIT License.
Festvox is a suite of tools for building synthetic voices for Festival. It includes a step-by-step tutorial with examples in document called Building Synthetic Voices.
Read more about this topic: Festival Speech Synthesis System