A small host of them. Every major search engine optimisation company seems to do one of these. Or hire someone who does. Realistically, they shouldn't be taken as Gospel as each one will interpret rather than document its findings. Forensic, these are not. But you'll get the drift. Oh yes, where you do get a specific figure from Google, I wouldn't recommend you believe it. Google tend to be so secretive about their genuine goings-on that experience (mine and others) indicates they give nothing away.
Backlink Checker
Another one.
Link Popularity tool
Another one, this time from Market Position.
Back-link Tool
A bizarre but extremely useful graph-type view of your back-links. Brilliant but temperamental.
Deep Link Analyser
Calculates how many of your IBLs are deep and their ratio to the home page IBLs.
The Link Harvester
Promises to analyse deeper, better than before. Some day.
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