GSite Crawler
Yellowpipe Lynx Viewer Tool
Open Site Explorer
Xenu Linksleuth
Link Diagnosis
Majestic SEO

Monitor Backlinks allows you to see in a glance how your new backlinks influences your average keyword position and the traffic received from Google.

The backlink check tool is running a series of tests to determine how many backlinks are pointing to the website or link you entered. Additional information is also being collected including anchor text used, Page Rank of the backlink source, and any potential flags or warnings for each individual link.