Janus - Java'n'UML Simultanously. A free CASE tool plug in for Eclipse with support for editing Java code and UML diagrams simultaneously. Right now this is also the home of the Image Export plug in to export GEF diagrams to various image formats.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.