Web master tools
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What constitutes a link showing up in Google web master tools? I know I have links to my site that do not show up in WMT. Have they just not been indexed or does not everything just show up? If it just doesn't show everything, what is the criteria for links to be displayed?
Also when I run OSE it does not show all the links that have been displayed in my Google profile for a while. Why is that?
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WMT dose't display all links as it will be easier to "calculate" the link juice of those links and start gaming the rankings. There is no criteria and it dose't make sense to tray find one.
It's just a general indicator of the total links you have for one domain name. It's a good indicator and together with OSE and other link profile screeners you an get a good overall feedback from your link profile.
OSE on the other hand provides a lot of good feedback but it's not that vast as far as data - OSE doesn't reach the "other space" in depth.
That means if you have a link and it dosen't show up in OSE and WMT it doesn't mean is not considered by google is just not shown.
You can also try majesticseo as it dosen't provide in depth information but it has a very vast database of links - and again, majestic seo won't provide all links either - just a larger pool.
Hope it helps.
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To add to that ahrefs.com is another service that has a pretty good sized database, but is of course not 'all of the internet' either.