Blueback links, backlink watch both are best free tools that is used in back link analysis and checking for website but if anybody known any others free back link checker tools then please share.
Yes SEO MOz tool bar is so useful and easy to use just down load this add-on tool bar and enjoy it.Its very easy to use. It will shows your external links in blue color.
These are some nice back link checker tools Open site explorer
MajesticSEO
Rank signals
Ahrefs
Alexa
Analyze Backlinks
Link Diagnosis
SEO Spyglass
Google (Enter "link:yoururl.com" to search)