The best free Keyword Bid Tool which combines keywords research tools is the Google Keyword tool.
This tool has been referred to as the AdSense keyword tool as it will not only return search criteria for keywords you have input, but if you select synonyms, it will also suggest a list of related words or phrases.
When Google completes its search and returns your results it will not automatically reveal the estimated cost per click per keyword. To get this information go to the box titled "Choose columns to display", open up the options, and go to the bottom and select All.
You now should see the estimated cost per click to get in positions 1-3.
With the estimated cost per click this can be sorted from highest to lowest, so in respect of a potential pay per click campaign, this keyword bid information is invaluable if you are on a tight budget. You are able to select those keywords with a cost per click that is not too high.
Conversely if you were optimizing your site for AdSense purposes, then obviously you would target your search engine optimization around the keywords with the highest bids.
Another free keywords research tool, but nowhere near as well known is that provided by You Tube. To find out what keywords You Tube visitors are using to find videos relevant to your keywords, simply type in to your browser You Tube keyword tool and this should result in locating this great keyword research tool.
There are many other keyword bid tools both free and paid, simply doing some quick web search queries, will reveal many of these.
Source by Ray D Harris