Dog Blue Software creates natural language processing and semantic search applications.

Try searching the web with Ask Bluey, the free search engine that adds colour to search results.

For Windows, try Yowks! - a custom web browser that features "semantic text search" to find information on a web page. Semantic search will find classes of topics within differing degrees of relatedness - simply put, a semantic search for "people" will hilight all the names on a page.

For all your dictionary needs, there is a web based interface for Wordnet 3.0. Wordnet is a free dictionary, published by Princeton University with numerous links between words based on semantic relationships. DBS' web based version also shows results from the Princeton WordNet Gloss Corpus which shows the part of speech and semantic index of each word in the definition.