Over the years we have tried and/or subscribed to dozens of SEO tools.  Here are a few that we like and use on a weekly basis:

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Majestic SEO provides valuable backlink data for research and analysis. Majestic SEO uses Citation and Trust flow as a metric for rating backlink profiles.

We wrote a review of Majestic SEO in our blog if you’d like to learn more.


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Open Site Explorer by MOZ is another valuable backlink research tool.
Moz has its own set of unique metrics to look at: Page Authority and Domain Authority, among other great tools in their PRO toolset.