I was wondering what is the best, (preferably free, or cheap) tool or website that people use to analyse the keywords of websites of their competitors. I know I can use the google external adwords tool, but I was wondering what everyone else uses.
Would signing up for something like "spyfu" for a few days do the job - or is there a free version of spyfu? - or is there another website or downloadable tool that is free or inexpensive that analyses keywords from my competition?
I spend so much of my time searching for new keywords I figure my time would be better leveraged, taking advantage of the keyword research my more established competitors have already done, and then probably expanding on it and going for the long tail from there.