These are keyword utilities primarily used to manipulate, expand, or analyze keyword lists that have been generated from keyword research tools.

Google Suggest:
http://labs.google.com/suggest/
Good for verifying correct spelling or additional keyword suggestions.

Keyword List Dedupers:
http://www.seochat.com/seo-tools/keyword-optimizer
Paste in your list of key terms and this tool will remove any duplicate entries. It will also re-order the list alphabetically

Duplicate Keyword Remover Tool
http://www.servermind.com/keyword-cleanup.php

Keyword List Generators:
http://tools.seobook.com/keyword-list
Allows you to generate a large number of keyword phrases based on permutations of keywords you enter.

3 Keyword Combination Tools from Ranks.nl
http://www.ranks.nl/tools/keyword_combinations.html
These tools go beyond the typical linkers & permutators, by allowing the user to specify additional results criteria like:

1) Don't include phrases starting with a certain keyword.
2) Don't change the order of certain keywords (e.g. "on line")
3) For two word combinations generated, give both the
AB and BA results.

Keyword Mixer
http://www.keywordmixer.com
The "Mixer" portion of this tool creates common domain name variations which can be useful to use as keywords in PPC -or as tags in web platforms that allow tags.

Jumbo Keyword
http://www.jumbokeyword.com
"JUMBO Keyword is a free web-based Google AdWords tool offering 70+ 1-click Google AdWords, keywords and text editing functions to help you create, manage and edit hundreds, even thousands, of AdWords keywords quickly and easily. There's even an ad editor to help you create ads for your Google AdWords campaigns." (description from the site)

Keyword List Sorter – useful for many other types of
sorting as well:
http://www.sortmylist.com

Local Keyword Generator:
http://www.5minutesite.com/local_keywords.php

Typo Generators:
http://tools.seobook.com/spelling/keywords-typos.cgi
http://www.seochat.com/seo-tools/key…ypo-generator/