pd: PD (aka Pure Data is a real-time graphical programming environment)
pd: 
pd: It is the third major branch of the family  of  patcher  programming
pd: languages  known  as  Max  (Max/FTS,  ISPW Max, Max/MSP, jMax, etc.)
pd: originally  developed  by Miller Puckette  and company at IRCAM. The
pd: core of Pd is written and maintained by Miller Puckette and includes
pd: the work of  many  developers, making  the whole package very much a
pd: community effort.
pd:                         http://puredata.info
pd:                             WWW.SLACKY.IT
pd: PackaGer Gohanz.