The Mimesis library is designed specifically to display tree-like data in tree hierarchies (including the tip-over-tree layout) or mind maps. It allows you to

• use it with WPF and Silverlight: the two versions share the same codebase, which means you can exchange diagrams between the two technologies.
• export to XML, tree-format and RTF
• collapse/expand branches
• group nodes (and a visualization of it)
• create custom node templates
• edit nodes inline
• filtering branches and nodes
• display node icons, set node color and more design features
• easily change layouts

The library will fit your needs if you are looking for

• Microsoft Sharepoint and Microsoft Dynamics visualizations
• a Business Process Modelling tools
• a workflow oriented applications (in fact, we do have implemented workflow solutions for some customers)

Related to this you should also have a look at:

• our G2 diagramming solution for Silverlight
• our iSee framework which also contains diagramming solutions (and visualizations, in general) and the iSee demo
• the Crystalizer framework which contains a more database-oriented visualization of database relationships (see the demo here)
• finally, we also have our spring-embedded data visualization kit called Graphite, see the demo here!

Of course, if you have a project in mind or wish to talk about the (Silverlight or WPF) solutions we offer, let us know.