The Xholon
framework for building loosely-organized systems
captures object interactions at runtime,
and creates UML 2.0 sequence diagrams using UMLGraph.
ruby-uml
traces aspects of an application
using UMLGraph to generate sequence and class diagrams.
The Politecnico Di Torino SoftEng group has extended UMLGraph into
the XUG
reverse engineering tool.
Adam Feuer's
PyUMLGraph
system applies the concept to Python programs.
The Glean
framework for generating feedback on a team's source code
supports the scripting of UMLGraph.