AthTek Free Voice Changer is a handy audio tool for Windows users. It has a very clean interface without any exaggerated color and overstated features. It clearly lists 4 steps for you to obtain the sound effects you want.
Hanso Player is an audio software offering great features like a smart interface, net streaming, mp3 wav converter, an integrated ID3 editor which makes renaming and changing files easier. It supports MP3, FLAC, AAC, MP4, WMA formats.
Aktiv CD Ripper is a great tool for creating direct digital copies of all your audio CDs and saving them as various popular formats including MP3s, WMAs, OGGs, or WAVs. The software is extremely easy to use and very fast.