Lossless Audio Checker - A utility to check whether an audio file is truly lossless or not.
Digital Level Meter - Display sound level
Spek - Spek helps to analyse your audio files by showing their spectrogram.
AudioTool - Whether you want to make music for the club, or you're aiming to put a few tracks to a film, Audiotool is a website geared towards putting the mixes at your fingertips. Read more about AudioTool.
REW - REW is free room acoustics analysis software for measuring and analysing room and loudspeaker...
Sound Meter - Professional sound level meter in your pocket! Features: ------- ¦ direct reading in dB