Java CoG Kit nightly tests (they haven't run in a while)

Graph Editor (well, more of a viewer (and very scalable at that), but there is some basic editing)

Karajan (a parallel scripting language (workflow language if you want). It should simplify many things if you're writing grid applications using Globus. But then you can also use SSH or its own service.)

My U of C page (almost as full as this one)