RealProducer Basic and RealProducer Plus are proprietary products of RealNetworks that convert digital audio in a range of file formats (including AIFF, AVI, MP3, MPEG-4, and QuickTime) into compressed RealAudio files (.ra, .ram, .rm) for distribution through RealServer or Helix Server. RealProducer Basic is free, while RealProducer Plus is available for purchase. Both run on the Windows and Linux operating systems only. RealProducer Plus includes features such as unlimited target audiences/bitrate streams and batch processing.