Csound is a sound and music synthesis system, providing facilities for composition and performance over a wide range of platforms. It is not restricted to any style of music, having been used for many years in at least classical, pop, techno, ambient
Pre-built binary installers are available for Windows, Mac OSX, and Linux and are available from the files section of this site. The following entails alternate methods of installing and building Csound.
Wiki: Homebrew OSX
Wiki: Building and Installing Csound 6 on Fedora 18
Wiki: Building CsoundQt for Csound6 on Debian-Ubuntu
Wiki: Building Csound with Visual Studio 2013
Wiki: Building csound~ for Max-MSP on OSX