d20 Reference - The Dungeons and Dragons 3.5 System Reference Document, formatted for quick reference and readability on the Android platform. Version 1.6 now contains base and psionic races and classes, feats, spell lists, combat actions, and magical items. $0.99 on the Android Market.
StoryDroid - A utility to help writers practice their craft and get past writer's block. Using a large collection of descriptors applied randomly to base templates, it helps provide the basic blocks for characters, items, and places a writer can use to fill in the blanks in their own stories. It can also generate prompts to help writers practice, and provides some basic tips for writing solid fiction. $2.99 on the Android Market.