Topic Map Explorer from Semantic Web Technologies - Personal Knowledge Management Software, Peer-to-Peer for Knowledge Management, Metadata Management: "Topic Map Explorer is a revolutionary way to organise, classify, search and find documents, emails, web links and contacts.
Documents are classified in terms of topics. They can be related to many relevant topics. This multi-dimensional classification makes finding the right documents easy.
Topics can be connected to other topics to capture knowledge, such as people with skills, or documents with themes.
Topic Map Explorer provides add-ins for Word and Outlook to help classify documents quickly and easily."