Worth to note that Librivox also gives a significant boost to text-to-speech and speech recognition research, currently librispeech corpus based on librivox is

Worth to note that Librivox also gives a significant boost to text-to-speech and speech recognition research, currently librispeech corpus based on librivox is the largest and quite useful corpus of spoken English. http://www.danielpovey.com/files/2015_icassp_librispeech.pdf http://www.danielpovey.com/files/2015_icassp_librispeech.pdf