FL studio

FL Studio (formerly known as FruityLoops) is a digital audio workstation developed by the Belgian company Image-Line. FL Studio features agraphical user interface based on a pattern-based music sequencer. The program is available in four different editions for Microsoft Windows, including FL Studio Express, Fruity Edition, Producer Edition, and the Signature Bundle. Image-Line offers lifetime free updates to the program, meaning customers receive all future updates of the software for free.
http://en.wikipedia.org/wiki/FL_Studio