sndpeek - a real-time audio visualization tool (animated, 3D)
Youlean Loudness Meter - Find your audio's true perceived loudness to prepare for TV and streaming services.
Zelscope - Zelscope is a Windows software that converts your PC into a dual-trace storage oscilloscope and...
Digital Level Meter - Display sound level
Spectralissime - Spectralissime High Definition Spectrum Analyzer by V.Burel
Spectro - Spectro is a freeware audio file analyzer for windows.