WordLookup - WordLookup is a program which can lookup the spelling of words based on an initial partial input of letters. As you enter more letters in the main search box, the list of words reduces accordingly
WordNetCE - Freeware English Dictionary/Thesaurus with advanced search features, including wildcard, regular expression, anagram, scrabble and sounds like. Complex relationship searches can be made from each available word type for any given search. Results are formatted and colour-coded; all searchable words hyperlinked in results
WordWordNik allows you to find the definitions of a word you enter or paste from the WordNik.com website. Enter a word and the program will search the WordNik.com website for definitions and place them into a database. You can also export the list into Pocket Word or CSV format. This service is provided by WordNik