Reaktor

Reaktor is a graphical modular software music studio developed by Native Instruments (NI). It allows musicians and sound specialists to design and build their own instruments, samplers, effects and sound design tools. It is supplied with many ready-to-use instruments and effects, from emulations of classic synthesizers to futuristic sound design tools. In addition, more than 3000 free instruments can be downloaded from the growing User Library. All of Reaktor's instruments can be freely examined, customized, or taken apart; Reaktor is a tool that effectively encourages reverse engineering. The free, limited version called Reaktor Player is a software that allows musicians to play NI-released Reaktor instruments, but not edit or reverse-engineer them.