[General] The JUMP Project

"The JUMP-Project is a suite of free, open-source applications that provide an extensible API and graphic user interface (GUI) for viewing and manipulating spatial data-sets. "The major projects of the JUMP Project suite include: the JUMP Unified Mapping Platform (JUMP); the JTS Topology Suite (JTS) and the JCS Conflation Suite (JSC).

http://www.jump-project.org/