WaveSurfer

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.
Features:
- Customizable - users can create their own configurations. Localization support.
- Extensible - new functionality can be added through a plugin architecture.
- Embeddable - WaveSurfer can be used as a widget in custom applications.
- Transcription file formats - reads, and writes HTK (and MLF), TIMIT, ESPS/Waves+, and Phondat. Support for encodings and Unicode.
- Multi-platform - Linux, Windows, OSX.