Ekelundh.Com: Crossword Solver Database
Partial word search with wildcards.
http://www.ekelundh.com/crossword/

Crossword Helper
Partial word search with a separate proper name list.
http://raru.adelaide.edu.au/craig/wow.html

Crossinary
Crossword dictionary tool for download on a PC.
http://www.hackcraft.net/code/crossinary/

Chris F.A. Johson's WordFinder
Completes words with missing letters, finds word with the same beginning or end, and finds anagrams of words and common phrases. Also allows search by word and phrase length.
http://cfaj.freeshell.org/wordfinder

CrosswordCheats.com
Site offering partial word search assistance.
http://www.crosswordcheats.com

Amo's Online Crossword Puzzle Dictionary
Offers partial word search with wildcards.
http://www.amo.qc.ca/cgi-bin/pub/ODico/dico.out

One Across
Search by clues, word lengths, or partial words with wildcards.
http://www.oneacross.com/

Crossword Dictionary
Searchable online puzzle solver. Contains more than 235,000 entries, including names and movie titles.
http://www.crossword-dictionary.com/

Crossword Puzzle Guide
Lists of common crossword answers, biblical names and mythological figures organized by word length.
http://www.infoplease.com/ipa/A0001806.html

Crossword Star
Digital solving aid and dictionary available for purchase.
http://www.crosswordstar.com/

Allwords.com
Used to solve clues.
http://www.allwords.com/solver.php

Crossword Tools
A web-based collection of crossword (and wordplay) related tools. Includes a crossword clue analyser, an anagram solver and generator and a letter pattern searcher.
http://www.crosswordtools.com/

FindTheWord.info
An online word pattern searcher. Includes searches for partial words, anagrams, palindromes, words in word, word bridges.
http://www.findtheword.info

Datrys
A word pattern searcher and anagram solver for Nokia Series 60 phones.
http://www.shadowplay.ltd.uk/datrys.html

xword dictionary
Searchable American clue database of 220 000 entries. Also contains letter pattern searcher.
http://www.xworddictionary.com/

Instant Crossword Tools
Simple but effective anagram solver and letter pattern finder.
http://www.chaucery.com/fun/crossword/

Crossword Clue Solver
Simple web-based letter pattern searcher.
http://www.crosswordcluesolver.com/

itanda Crossword Word Search
Instant solutions to anagrams and wildcard searches based on the UK Advanced Cryptics directory.
http://dictionary.amcd.co.uk/crossword.php

Onelook
Primarily a dictionary site but also has the ability to do wildcard searches on the words it knows about.
http://www.onelook.com

Crosskit.com
Includes a free online crossword dictionary for US style crosswords.
http://www.crosskit.com/index.php?dict

Crossword Solver
Online word and anagram finder that uses the UK Advanced Cryptics Dictionary.
http://www.wordfun.ca/