WaveSurfer is an open source tool for sound visualization and manipulation. Typical applications are speech/sound analysis and sound annotation/transcription. WaveSurfer may be extended by plug-ins as well as embedded in other applications.
TclSpeech is an extension package to Tcl written in C that gives Mac OS Classic and Mac OS X users access to Apples Speech Manager through scripting in Tcl.
The F Modular Synthesizer is a tool for creating all kinds of sounds, white and low-band noises and midi-like tunes with modulated frequencies, volumes, balances and many more features.
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AGTK is a suite of software components for building tools for annotating linguistic signals,
time-series data which documents any kind of linguistic behavior (e.g. audio, video).
The internal data structures are based on annotation graphs.