version 5.01 was released on march 18, 2006 – 20 years after csound's first release. csound 5 is available in binary and source code for linux, microsoft windows and mac os x from the sourceforge csound project. it is much improved and expanded compared to the original software, effectively made into a software library with an api. a variety of front ends have been developed for it. in addition to the basic c api, there are also python, java, lisp, tcl and c++ among other bindings, like one from haskell which allows control of csound from a purely functional environment.