Discover 3D sound

Unity/Unreal Engine:

Digital Audio Workstations:

Sennheiser Orbit - Binaural AAX, VST, VST3 and AU plugins for both Mac and Windows.
Ambix - VST Ambisonic plugin suite by Matthias Kronlachner.
SPARTA - free VST plugin suite.
Ambi Pan - 3D panner for cinematic VR.
Facebook Spatial Workstation - A free software suite for designing spatial audio for 360 video and cinematic VR.
IEM Plugins Suite.
SPAT Gris - A free spatialization software for MacOS.
Wig Ware - free VST plugins for Ambisonics processing.
SoundField - Rode VST and AAX plugins for ambisonic processing.

Max/MSP:

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.

Other:

Envelope - Envelope software for Ableton Live.
Spatial audio - SoundScape renderer, standalone software for Linux and MacOS.
3D Tune-In Toolkit - an open-source standard C++ library which includes a binaural spatialiser.
PyBinSim - binaural spatializer in Python.

Free tools: