8 Popular Keyword Research Tools

[Steve]

1. AdWords Keyword Tool
2. Google Search-Based Keyword Tool
3. Keyword Discovery
4. Wordtracker
5. Google Suggest
6. Yahoo! Search Assist
7. Ask TypeAhead Search Suggestions
8. Rank Tracker

[chrishubber]

The two long standing tools of choice for many search marketers, Keyword Discovery and Wordtracker, battled it out and in the end, tied.

[takeshiro]

There's one in online-utility.org..

[jenli29]

Try SEcockpit for keyword research, it is a nice tool too.

[mickeyy]

I use a combination of Google adwords & Travis traffic. I like certain features from both - if they're free then I suggest try them out and see which one you like.