Ycad is a library of CAD functions in Java. Currently only DXF is supported for reading, viewing and writing. The DXF drawing may be rendered to a Graphics object for printing or imaging.
libmng -THE reference library for reading, displaying, writing and examining Multiple-Image Network Graphics.
MNG is the animation extension to the popular PNG image-format.
FreeMet is a meteorological program which provides weather maps, radar movies, and forecasts in one GUI. New functions can be added easily by writing new plugins which download, parse or process existing data available on the internet.