Free tools:

Digital Audio Workstations:
  • SPAT - Max/MSP software suite for spatialization of sound signals in real-time intended for musical creation, postproduction, and live performances.
  • Jamoma for Max - Jamoma patches for Max/MSP.
  • Spatium - a set of free, open source and modular software tools for sound spatialization.
  • ICST Ambisonics tool - A set of externals for MaxMSP for Ambisonics surround sound processing and source-control in three dimensions.