Indeed, Volumio is far from the only choice, there’s also;
- Mopidy - https://www.mopidy.com/
- shairport-sync (for AirPlay) - https://github.com/mikebrady/shairport-sync
- Rune Audio - http://www.runeaudio.com/certified-devices/#Raspberry-Pi
- Pi Music Box - http://www.pimusicbox.com/
- VLC - use
cvlc --intf http --http-password raspberryon its own to host an HTTP or RC interface
And probably a bunch of other options I haven’t heard of.
Of course everything will have trouble with the Zero W except vanilla Raspbian at the moment, there’s nothing we could do or could have done about that. However, some might trivially be fixed with a “sudo apt-get update && sudo apt-get upgrade”- this unfortunately doesn’t work on Volumio.