by Eyes-Free Project
Port of the eSpeak engine that runs on Android.
To enable it:
1. Menu > Settings > Voice input & output > Text-to-speech settings
2. Check "eSpeak TTS".
3. Set your "Default Engine" to "eSpeak TTS".
Underlying technology — Used to support Google translate and allows you to speak to your phone and it to speak back to you. Useless by itself :)