You don't need to have software to analyze competitors backlinks or anything. open a Excel page and then make a tab for each keyword you target. Then open Google and search using each keyword. check first 10 pages and save all sites which you can get a black link in some way. repeat this for each keyword. Now you can do same for Yahoo and Bing. when you are done you will have a decent list of potential sites which you can try getting back-links. Sometimes you will need to search 20 - 30 pages. Also check the Google Blog search too.