- Google Adwords Editor: http://www.google.com/intl/zh-CN/adwordseditor
- Adwords Wrapper: http://www.mikes-marketing-tools.com/adwords-wrapper.html
- Keyword Combiner: http://www.searchenginepromotionhelp.com/m/keywords-combiner/word-combinations.php
- Google Angency Toolkit: http://www.google.com/agencytoolkit/
- Keywords Typo Generator http://www.seochat.com/seo-tools/keyword-typo-generator/
- Visual Thesaurus
AdWords Editor is a free Google application that you download onto your desktop. It allows you to work offline and upload your changes when you are ready
A free tool brought to you by Mike’s Marketing Tools that quickly and easily changes a raw search term into one or all of Google’s match types.
Quickly merge two or three lists of words.
It’s a one stop shop for all the resources that Google offers agencies and individual advertisers.
It’s used to look for some keywords which people will type by mistake
OK so this one is not 100% free but for $2.95 a month we decided it is close enough! Basically the visual thesaurus helps you find new synonyms while displaying them in a handy word map.

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