Google Adwords is the Good tool for keyword research it's free tool.
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I only use Google Keyword Tool as it is very effective for me. I just use other software to analyze all the keywords I search. I keenly check its competition and filter those keywords that I can use well and put less effort on those keywords that have high competition.
Google adwords is the best tool in keyword analysis. It shows all the factors related to number of competitions to the selected keyword. Keyword research must be done carefully since it is a important factor to be considered before optimizing the web site.
There are numerous free tools available on net such as Google keyword tool, niche bot, overture keyword selector tool, pixel fast, digital pint’s keyword suggestion tool but the best tool which I like is Google keyword tool.