Comparison of speech synthesizers

Here is a non-exhaustive comparison of speech synthesis programs :

	Creator(s)	First public release date	Latest stable version	Software license	Cost
Apple PlainTalk	Apple Inc.	1984	2007, October 26	?	?
Cepstral	Cepstral	?	?	Proprietary	?
CHIPSpeaking	John T. McF. Mood	2000, March 14	2001, January 19	Proprietary	Free
CircumReality TTS engine	mXac	2003	2009, June 6	Proprietary	?
Dhvani	Ozakil Azim Santhosh Thottingal ...	2005	2008, November 5	GPL	Free
DSpeech	Dimitrios Coutsoumbas	?	?	Freeware	Free
eSpeak	Jonathan Duddington	2006, February 10	2008, December 23	GPLv3+	Free
Festival Speech Synthesis System	CSTR	?	?	Open source	Free
FreeTTS	Paul Lamere Philip Kwok Dirk Schnelle-Walka Willie Walker ...	2001, December 14	2009, March 9	BSD	Free
IVONA TTS	IVO Software	2005	?	Commercial	?
Japplis Speech	Japplis	?	2009, February 28	?	Free
Kurzweil 1000 and Kurzweil 3000	Kurzweil Educational Systems, Inc.	1996	2005	?	?
Nuance Vocalizer	Nuance Communications, Inc.	?	?	Proprietary	?
NuSuara Malay TTS	NuSuara	?	?	?	?
Praat	Paul Boersma David Weenink	?	2009, June 21	GPL	Free
RealSpeak	Nuance Communications, Inc.	?	2007	Proprietary	?
SoftVoice TTS	SoftVoice, Inc	1979	?	Proprietary	?
Software Automatic Mouth	Don’t Ask Software	1982	?	?	USD$50 to $200
Vocoder	?	1930s	?	?	?
	Creator(s)	First public release date	Latest stable version	Software license	Cost

Technical details

	Online demo	Available language(s)	Available voices(s)	Programming language	Operating system(s)
Apple PlainTalk	?	English (American) ...	15+	?	Macintosh
Cepstral	Yes	English (American) English (British) Italian French (Canadian) German Spanish (American)	25	?	Mac OS X Windows i386-Linux x86-64-Linux Sparc-Solaris i386-Solaris
CHIPSpeaking	No	All Agent 2.0 Interface in English	Any Agent 2.0 voice	Visual Basic 6.0	Windows
CircumReality TTS engine	Samples	English (American)	8	SAPI 5.3	Windows
Dhvani	Samples	Hindi Kannada Marathi Malayalam Gujarati Bengali Telugu Panjabi Tamil Oriya	?	C	POSIX
DSpeech	Samples	English (American) English (British) Dutch French German Italian Japanese Korean Portuguese Russian Spanish	Several	?	Windows
eSpeak	Samples	English ...	Several	C++	Linux Windows Mac OS X RISC OS
Festival Speech Synthesis System	Yes	English ...	Several	C++	Linux Windows
FreeTTS	?	English ...	Several	Java	Cross-platform
IVONA TTS	Yes	English Polish Romanian	5	C/C++	Cross-platform
Japplis Speech	Yes	English	1	Java	Cross-platform
Kurzweil 1000 and Kurzweil 3000	?	?	?	?	?
Nuance Vocalizer	?	English (American) English (British) English (Australian) Portuguese (Brazilian) French (Canadian) German Spanish (Latin American)	10+	C/C++	?
NuSuara Malay TTS	Yes	Bahasa Malaysia	?	?	?
Praat	?	?	?	C	Windows Linux Macintosh FreeBSD Solaris
RealSpeak	Yes	Basque Catalan Cantonese Czech Danish Dutch English (American, Australian, British, Indian, Irish, Scottish and South African) Finnish French (Canadian and French) German Greek Hindi Italian Japanese Korean Mandarin (Mainland and Taiwan) Norwegian Polish Portuguese (Brazilian and Portuguese) Russian Spanish (Castilian and American) Swedish Thai Turkish	50+	C/C++	Windows Linux Embedded platforms
SoftVoice TTS	Samples	English Spanish	20+	?	Windows Linux Embedded platforms
Software Automatic Mouth	Samples	?	?	?	Some Apple computers (including the Apple II, and the Lisa) Some Atari models Commodore 64
Vocoder	Samples	?	?	?	?
	Online demo	Available language(s)	Available voices(s)	Programming language	Operating system(s)