This article mentions the Waves NX system, but I think it's important for those interested to know that the Waves NX system is rather half-baked. It is not extensible, nor open source in any respect. It's proprietary and generally unavailable in any useful contexts.

I was also surprised to see no mention of the Web Audio API implementations of HRTF and multi-channel ambisonic decoding down to binaural in the browser. This may well be today's most sophisticated approach to spatial headphone-driven audio.