Ohm Studio - Ohm Studio is the first real-time collaborative digital audio workstation.
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Oceanaudio - Ocenaudio is a cross-platform, easy to use, fast and functional audio editor.
Amped Studio - Modern web based music studio and production environment
GoldWave - GoldWave. Digital Audio Editing Software. Record • Restore • Convert • Analyze. Fully loaded to do everything from the simplest recording and editing to the most sophisticated audio processing, restoration, enhancements, analysis, and conversions.
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.