FreeTTS
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FreeTTS is an open source speech synthesis system written entirely in the Java programming language. It is based upon Flite . There is active development happening in the FreeTTS project. FreeTTS is an implementation of Sun's Java Speech API.
The voice quality is good and FreeTTS supports end-of-speech markers. Gnopernicus uses these in a number of places: to know when text should and should not be interrupted, to better concatenate speech, and to sequence speech in different voices.