AudioTool - Whether you want to make music for the club, or you're aiming to put a few tracks to a film, Audiotool is a website geared towards putting the mixes at your fingertips. Read more about AudioTool.
Cubase - Cubase is one of the world’s most powerful music creation software packages. From first idea to finished recording, Cubase helps you to make outstanding music.
LinuxSampler - LinuxSampler - free, open source pure software audio sampler with professional grade features.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
Samplr - Samplr app for iPad lets you make music and play with sound by touching it with your fingers.
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.