Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
iEasyRecorder - iEasyRecorder is a powerful Mac audio recording program which allows you to record audio, sounds and music from any applications.
TwistedWave - TwistedWave is one of the unique audio editors that allow you to edit your music file online without any installation.
ScreenRec Streaming Video Recorder - ScreenRec is a free streaming recorder with audio that lets you capture hours of live video from any website.
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.
MP3myMP3 - MP3myMP3 Recorder saves any audio you hear on your computer straight to mp3 or wav.