majesticseo.com is best website to check backlinks....

There are many tools available for checking backlinks of your site like ahrefs..

Traffic travis
 

You can use traffic travis v4. This software can do a lot of other things such as evaluating how well your competitors are doing, research keywords...

You can use ahrefs (you need to pay to see all backlinks), backlink watch, traffic travis 4.0. Hope it helps :D

There are so many tools to check backlinks but webmaster tool is best for check our website's backlinks.

How to find your competitors back links
Find here http://goo.gl/pncW1m

There are lot of tools to check backlinks. You can check your website backlink with ahrefs.com tools.

Just type backlink checker in google and you will get hundreds of options.

backlink watch check backlink for any website.

there are various tools for checking the back link of site backlinkwatch, ahref and many more

To check back links to your site,
Alexa
Webmaster tools

These are the tools are used to check the back links to your website.

Webmaster tools doesn't show all backlink, i use ahref and majestic seo.