Data Visualization

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http://protege.stanford.edu/

The Protégé Ontology Editor and Knowledge Acquisition System

Protégé is a free , open source ontology editor and knowledge-base framework. The Protégé platform supports two main ways of modeling ontologies via the Protégé-Frames and Protégé-OWL editors.
Mind Mapping & Diagrams

Graph theory - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/Graph_theory In mathematics and computer science , graph theory is the study of graphs , mathematical structures used to model pairwise relations between objects from a certain collection. A "graph" in this context is a collection of " vertices " or "nodes" and a collection of edges that connect pairs of vertices. A graph may be undirected , meaning that there is no distinction between the two vertices associated with each edge, or its edges may be directed from one vertex to another; see graph (mathematics) for more detailed definitions and for other variations in the types of graph that are commonly considered.
http://clarkparsia.com/pellet/features

Pellet Features

Pellet supports reasoning with the full expressivity of OWL -DL ( SHOIN(D) in Description Logic jargon) and has been extended to support the forthcoming OWL 2 specification ( SROIQ(D) ), which adds the following language constructs: Ensures that an ontology does not contain any contradictory facts.

[Omnigator] Welcome Page

http://www.ontopia.net/omnigator/models/index.jsp The Omnigator is a technology showcase and teaching aid designed to demonstrate the power of Topic Maps .