When the time comes to research keywords for our SEO campaign, many of us make a B-line toward the Google AdWords Keyword Tool. Granted, this is an excellent tool and one of the cornerstones of solid keyword research. But it's not the only tool you have available to you. In fact, there are plenty of free keyword research tools that go beyond this single staple.

Take for example these five keyword research tools you should have in your arsenal when developing an SEO campaign:

google-suugest

Google Suggest: This can be a great way to find synonyms and variations of your keyword as you expand your side-wide keyword list. Just start typing a keyword in the search bar and a drop down list of related terms will come up. Bingo.

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The Google Wonder Wheel: I have to admit, when this feature went live in 2009, I wasn't sure what to expect. But now, I find myself using it time and time again to not only help me with keyword research, but also with finding related subjects to write about. Following a similar structure of a mind map, the Google Wonder Wheel pulls related categories and results depending on what you search.

internal site search

Internal Site Search: If you have a website with an internal search function built in, it may not be a bad idea to look through it to find popular searches that you can optimize for. Maybe people are looking for something specific. Maybe they're just browsing. Either way, you'll get a closer look at both keywords and the user experience.

Google Analytics: Noticing a lot of keyword-related traffic? See if you can further capitalize on it by optimizing for it as well as several variations. Granted, you may be getting some traffic from funny searches, but sort through those to find little keyword goldmines that you can use throughout your content.

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The Good Ol' Thesaurus: Crack open that dusty book that's sitting on your desk or browse through an electronic copy. Either way, the trusty thesaurus can help you through the keyword research process by providing you with synonyms that you might not have thought about.

There you have it. Five keyword research tools that can help you create a more well-rounded campaign - without having to use your AdWords login.

Now, what keyword research tools do you use?