eSpeak - eSpeak is a compact open source software speech synthesizer for English and other languages, for...
ttsMP3.com - ttsMP3.com is a web application that can convert your texts into audio MP3 audio files and vice versa.
Balabolka - Balabolka is a Text-To-Speech (TTS) program.
VoiceMaker - Voicemaker is a web application with which you can convert your texts into audio by simply importing the text onto the dedicated text box.
Gespeaker - Gespeaker is a GTK+ frontend for espeak.
Notevibes - Online Text to Speech Converter with 57 natural voices. Download your files as mp3 and Wav. For business and personal usage.