Olympos is an holistic MDA/MDD approach to projects. It allows to create Web (PHP, J2EE), Desktop (c#) and Mobile applications (.NET, J2ME) from a UML model. Features a Web 2.0 IDE, a generator based on openArchitectureWare and several cartridges.
Diagrammer for .Net Assemblies, also support for Javascript. Good for assembly dependencies. Good for showing the call graph in complex methods. Good for showing the jumps in IL. Good for getting an overview of where the complex parts of a system are.