Linkbuilding play major role to boost your website ranking in Google or to increase PR for your website. You need links from quality sites in order to rank well and get some targeted traffic. Competitor websites analysis is a good way to find relevant links for your website. You can increase backlinks by article submission, link exchange or social bookmarking. There are some good tools available which helps you to find relevant websites related to your theme where you can add your website link to increase ranking for your main keywords. Link building is such a time consuming and detailed process that is the only reason people look for tools and techniques to maximize their time. 
Link Harvester www.linkhounds.com
makes sorting out duplicate links from the same site easy, which allows you too quickly and deeply query the Yahoo! or MSN backlinks databases.It is a free keywords suggesion tool from Google. You can easily search any keyword or key phrase as per your website theme. You just need to simply enter any keyword & it will show you some related keywords with global & monthly search count for that particular search term.
Backlink Analyzer www.axandra.com
A free link popularity/link analysis tool. It shows what anchor text is linking into a page or site.
SEO Profiler Linkbuilding Tool www.seoprofiler.com
Backlink IQ reports help you to get new backlinks by analyzing the backlinks of your competitors. Find out why your competitors rank highly on Google and use that information to get better rankings for your own website.
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