Pig2D is a game engine for Java that uses a sprite-based interface.
Pig2D is a game engine that uses a simple sprite-based interface that was made for users of the Scratch language (http://scratch.mit.edu)
for translating to "Real" programming languages.
Helen is an adventure game engine written in Java 6, designed to support multiple users. Where Helen attempts to be unique is enabling users with powerful extensibility without a grammar-heavy language (thanks to Groovy).