Spectro - Spectro is a freeware audio file analyzer for windows.
Lossless Audio Checker - A utility to check whether an audio file is truly lossless or not.
sndpeek - a real-time audio visualization tool (animated, 3D)
FL Studio - Image-Line's FL Studio, now on it's 12th version, is a well-known music production suite and the most popular beat processor on the market, due no doubt to its longevity. Read more about FL Studio.
SendFox - Create automated newsletter campaigns with an affordable email marketing solution
Adobe Audition - Mix, edit, and create audio content in Adobe Audition CC with a comprehensive toolset that includes multitrack, waveform, and spectral display.