Internet Text Radio,designed around freeTTS,connects to a text server and tunes to a channel.The server starts pumping text data for that channel to the client, which converts text to speech, playing back the text as audio,like an internet radio station.
The MRCPv2 protocol is designed to allow client devices to control media processing resources, such as speech recognition engines. MRCP4J provides a Java API that encapsulates the MRCPv2 protocol and can be used to implement MRCP clients and/or servers.
VoIM is a Java based Jabber client that will provide excellent text instant messaging capabilities as well as the ability to send and receive voice messages.