Wavosaur is a free audio editor with VST support and many features for editing
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Easy MP3 Cutter - the best tool for lossless and fast MP3 and WAV audio cutting!
Mp3 Knife is a simple tool for extracting mp3 clips from your Mp3's.
Flowmotion includes a trigger sequencer and wet/dry blend control and more.
you can edit wav/ mp3 audio files you download.
Cubase Essential 4 - Personal Music Production System.