SHri MP
Program-Transformation.Org: The Program Transformation Wiki
SHriMP: Simple Hierarchical Multi-Perspective views.
Homepage: http://shrimp.cs.uvic.ca/shrimp
More (historical) info at http://www.csr.uvic.ca/~mstorey/research/shrimp/shrimp_software.html
See also: SoftwareVisualization, RigiSystem.