The Speech Dispatcher project provides a high-level device independent
layer for access to speech synthesis through a simple, stable and well
documented interface.
Key features:
o Common interface to different TTS engines.
o Handling concurrent synthesis requests - requests may come
assynchronously from multiple sources within an application and/or
from different applications.
o Subsequent serialization, resolution of conflicts and priorities
of incomming requests.
o Context switching - state is maintained for each client connection
independently, event for connections from within one application.
o High-level client interfaces for popular programming languages.
o Common sound output handling - audio playback is handled by Speech
Dispatcher rather than the TTS engine, since most engines have
limited sound output capabilities.
WWW: http://devel.freebsoft.org/speechd