BOSEbuild Speaker Cube - Build-it-yourself Bluetooth speaker for curious kids
Astra by Cesbo - Talk to Alexa anywhere, from your iPhone
Sonos One - A self-contained, Alexa-connected speaker from Sonos
Reverb - Use Alexa on your Mac, iPhone and Android
SOUNDBOKS - The loudest battery-powered speaker on the market.
Amazon Blueprints - Create your own Alexa Skill in minutes