Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
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.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
Reaper - Reaper is a focused digital audio workstation (DAW) developed by Cockos. In the creation of the software, the digital audio technology company intended to make audio editing accessible to the masses.
Ableton Live - Ableton makes Push and Live, hardware and software for music production, creation and performance. Ableton´s products are made to inspire creative music-making.
WavePad - This audio editing software is a full-featured professional audio and music editor for Windows and Mac.