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.
Kontakt - With KONTAKT 6, you can sound like a snare drum, a symphony orchestra, or anything in between, from a universe of sampled instruments.
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.
UVI Falcon - Sampler/synth hybrid instrument
Ohm Studio - Ohm Studio is the first real-time collaborative digital audio workstation.
Magix Independence Free - Magix Independence Free is a sampler software that allows you to create any type of sound with its 2Gb library.