Version 1.0 of Sonic Visualiser is now available. http://www.sonicvisualiser.org/
Sonic Visualiser contains advanced waveform and spectrogram viewers,
as well as editors for many sorts of audio annotations. Besides
visualisation, it can make and play selections based on the locations
of automatically detected features, seamlessly loop playback of single
or multiple noncontiguous regions, synthesise annotations for playback,
and slow down playback while retaining display synchronisation. Sonic
Visualiser also supports the Vamp plugin API for plugins that extract
descriptive or analytical data from audio.
Sonic Visualiser is Free Software distributed under the GNU General
Public License. The 1.0 release is available now in source code form
or as binaries for Linux, OS/X, and Windows.