This document discusses several software development kits (SDKs) for creating Android applications. It describes Basic4Android, an alternative to Java for building Android apps that includes a visual designer. Gimbel is mentioned as an SDK for location-based apps, and Titanium is described as a multi-platform SDK that uses JavaScript. Finally, Vuforia is summarized as an augmented reality SDK that allows positioning virtual objects in relation to images viewed through a mobile camera.