SonosMixerFan

Control the volume of your Sonos speakers easily and precisely with full screen sliders. This is an open source app available at https://github.com/hallab/sonosmix with a support forum available at http://sonosmix.userecho.com/ . It is written in python using the Kivy (http://kivy.org) framework for the GUI and SoCo (https://github.com/rahims/SoCo) for communicating with the Sonos speakers.
This version is identical to SonosMixer, but comes with a price to allow our fans to support the app.