Sonos Alternative (Preferably HIFI and FOSS Friendly)

[pr8dan]

SONOS is phasing out speakers by no longer offering software updates after May 2020. Even worse, all SONOS networks containing even one such phased-out speaker will no longer be updated.

I would appreciate recommendations for alternative systems, preferably high quality, connected speakers with open APIs and FOSS friendly. Any ideas?

[PaulHoule]

I am mostly happy with my Denon HEOS system. The API is pretty easy to work with, and it's got the big advantage that it works with A/V receivers which will give you much better sound than others.