Bell Labs
http://www.bell-labs.com/

Festival, Speech Syntheis System
http://www.cstr.ed.ac.uk/projects/festival/

PSOLA, Pitch Sychchronous Overlap Add Method
http://www.fon.hum.uva.nl/praat/manual/PSOLA.html

MBROLA
http://tcts.fpms.ac.be/synthesis/mbrola.html

DISC Survey
http://www.disc2.dk/tools/SGsurvey.html#narr

Speech Synthesis esempi
http://www.ims.uni-stuttgart.de/~moehler/synthspeech/

Hidden Markov Model Toolkit
http://htk.eng.cam.ac.uk/