SDK

There was an SDK provided, but it was never officially permitted for further distribution beyond the initial Kickstarter users. It was designed to let you compile packages for the Almond+ without rebuilding the entire firmware, and allowing you to keep the vendor-specific additions like the fancy web and touchscreen UIs. There was also some sort of Websocket API. The link in that forum post (for people with access to the developer forum) is for version 2.3. Version 2.4 is the latest, but the link is broken. Apparently, it doesn't even work for the latest firmware released on January 2017, so the SDK is of limited utility.