Parlatype is a minimal audio player for manual speech transcription, written for the GNOME desktop environment. It plays audio sources to transcribe them in your favourite text application.
eXtace is a Audio Visualization plugin for the X-Window System. It connects to ESD (Enlightened Sound Daemon) and displays the audio data as either a pseudo 3D flying landscape, pseudo 3D pointed landscape, 16-256 channel graphic EQ, multi-mode Oscilloscopes, Horizontal Spectrogram, or a combination Hi-res FFT with a Vertical Spectrogram. All modes are fully scalable to nearly ANY resolution! (within your CPU/X11 capabilites) Resolutions up to 1600x1200 at 40 FPS use typially less than 30% CPU,