The MagPI magazine #57 contains a DIY project for a Google Home in a Box:
Copies have been shipped to North America, and are available at Barnes & Noble, Micro Center and other stores. These went on sale on the same day as the UK edition, although stores may not have put them out until today.
I Just got mine for $14.99, you get the magazine plus the kit cardboard, speaker, and a voice hat to build (HAT = Hardware Attached on top)
more details here:
bear in mind you need a Raspberry PI 3, familiar with the PI/Linux system,
and this is a DIY project: soldering, patience, etc.
EZ-Builder is not available in Linux although you can develop (.NET) your own custom solutions/ideas with EZR mono SDK and gain control of the EZ-B.