Audacity is a completely free audio editor, result of an open source initiative! Despite all the professional-level set of features that Audacity has — such as multi-track editing and support for live recording —, the simplicity of its UI is so impressive. Audacity supports the popular audio formats including WAV and MP3 but you will have to download one separate encoder for the latter. Other notable features of Audacity include easier editing through cut and paste, the feature for noise reduction and vocal reduction, etc. Also, when we come to the editing aspect, there are a lot to talk about, such as navigation controls and different kinds of editing processes. If you check out the screenshots, you can understand how easy the User Interface is, despite its richness in terms of features. Yet another thing worth-noting about Audacity is its multi-platform support. By the way, it has some truly useful sound effects too.
Price: Free Availability: Microsoft Windows 8, 7, Xp; Mac OS X 10.5 to 10.10 and Linux