Mozilla TTS is a collection of open-source [tts] tools based on machine learning/DNNs with the goal of providing a free very modern TTS resource for developers. It includes some pre-trained models as well as the resources necessary to efficient train + test new models supporting things like multi-GPU training and a test server.
URL: https://github.com/mozilla/TTS
Includes parts or full implementations of several other open source [vocal-synthesis] frameworks including [tacotron] from [wavenet].