Digital Level Meter - Display sound level
Spectro - Spectro is a freeware audio file analyzer for windows.
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.
Friture - Friture is a program designed to analyze audio input in real-time.
Sound Meter - Professional sound level meter in your pocket! Features: ------- ¦ direct reading in dB
Lossless Audio Checker - A utility to check whether an audio file is truly lossless or not.