wordnet

WordNet

 2.1
Free (Open Source)   

A dictionary for the English language, which contains conceptual differences and example sentences.

jdictionary
Free (Open Source)   

This interesting program offers you a simple and efficient dictionary.

wordweb

WordWeb

 10.32
Free   
1

A comprehensive English dictionary which can be integrated into our Word programme.

aspell

Aspell

 0.50.3
Free (Open Source)   

Write texts without mistakes in spelling and grammar.

artha

Artha

 1.0.2.0
Free   

An English dictionary for your desktop.