Array is a "Light Brite" style animation tool written in Java with Flash Export. There is a version for Java on UNIX / Windows / Linux and 2 separate Versions for Mac OS X systems!
http://www.mediumk.com/array/images/cat.swfDESCRIPTION
Array is an easy-to-use animation program. If you know the children's toy where you poke transparent colored pegs through a backlit screen (LiteBrite), Array uses the same idea, but with multiple screens, to create animation. You color points on a sequence of frames. There are various functions to manipulate the points. You can play, save, and reload your animation. You can export your animation as a Flash movie.
Array requires the Java 2 Runtime Environment (J2SE 1.4 or better).
http://www.mediumk.com/array/