Amazon Echo Hacking Wiki

I have done it myself, but I don't know enough to really dig in and take over the sound stuff like I'd want to. It runs tinyalsa iirc.

That page lays out the path/story of originally creating the software needed to root the original Echo.

  Our research sets out to look at how this system of interconnected smart devices affects our privacy.. and how can we show this with a practical analysis and vulnerability analysis of our own smart devices.

  Even though the attack surface of SPA is conspicuously broad and there has been a significant amount of recent research efforts in this area, research has so far focused on a small part of the attack surface.. this is the first..  characterization of the security and privacy issues and countermeasures of SPA.

  We conclude that though numerous privacy concerns and security vulnerabilities associated with the device are mitigated, many vulnerabilities still need to be addressed.

Also interested if anyone has done anything with the discontinued Glow.