JeSpeak is a Java library that bridges eSpeak, which is a compact open source software speech synthesizer. JeSpeak uses JNI to make native call to libespeak.
Audacity Policial (aka Audacity Police) is an extension of Audacity sound editor that was created to help police and justice investigations based on phone call and environmental recordings, supporting audio analysis and transcription.
GibPhone is a highly extensible VoIP/IM client for the .NET framework that uses a powerful plugin engine to allow for UI extensions and any call control stack / media payload / transport protocol combination.