Snapcast is really cool, Johannes did an awesome job! I used it for a long time at home on multiple RaspberryPis. I've been working for some time on a more user-friendly and cross-OS alternative. It's available here: https://github.com/geekuillaume/soundsync

I think I'm going to try to integrate net-boot in Soundsync this weekend. It would be awesome to be able to install Soundsync on any computer on the network, turn on an option and then just start the rPi to get it to play music.