The current version can read and write shapefiles simple GML files as well as
several other vector formats via plugins. It can also read from several
spatial databases and write to postgis. It has support for images and for WFS
and WMS web-services. So you can use it as GIS Data Viewer. However, its
particular strength is the editing of geometry and attribute data. One can
style the appearance of data in OpenJUMP's map display and can export the view
to SVG. A growing number of vector analysis tools for topologic analysis and
overlay operations is available too. OpenJUMP 1.8 adds coordinate reference
system transforms and 1.9 adds several spatial databases reading capabilities
as well as a lot of bug fixes and improvements.

Detailed information on OpenJUMP can be found on our Wiki (
http://ojwiki.soldin.de/index.php?title=Main_Page ).