RoboBrain SDK is a simple, lightweight 2D game engine for Android phones and tablets. It supports OpenGL ES 1.0 Rendering, a custom GameActivity class, a World/Entity system, basic physics and collision detection, animated and static sprites, and support for Multitouch and accelerometer input.
qPDF Toolkit is an Android Java SDK that allows app developers to quickly add PDF functionality to their apps. It provides a wide range of functions that can be used by apps to create custom PDF documents and reports, to allow users to modify documents, and to show PDF content to end users. It can add content to new or existing pages, assemble, split, merge, and combine documents, remove pages, encrypt documents using RC4 or AES, set document permissions, set and get interactive form field data, convert documents to JPEG and PNG images, render pages to Bitmap or Canvas objects, extract text content, and edit document properties.