GridNexus is a graphical system for creating and executing scientific workflows in a Grid environment.
GridNexus, derived from the open source project Ptomlemy II, allows the user to assemble complex processes involving data retrieval, analysis and visualization by building a directed graph in a visual environment. Such a dataflow creates a script written in a new language called JXPL. The script can be executed either locally or in a remote managed-job environment. (Information provided by Ron Vetter)