Three of the best :

WordTracker
WordTracker offers both keyword research and link building services.
as a linkbuiding tool, wordTracker helps you identify link prospects quickly, it also help you to quickly identify your competitor’s linking strategies.
and as a keyword research tool, WordTracker helps you perform analytical studies about your market through keyword research.

SEMRush
SEMRush tool is the complete tool you will ever need for a thorough and indepth understanding of link building. This tool offers comprehensive and analytical details into your link building patterns, strategies and those of your closest competitors with clear picture of each metrics.

SEOMoz PRO
SEOMoz PRO isn’t just about link building, but also it’s a complete SEO management and social media marketing.

I recommend to use tools like Ahrefs to get your competitors backlinks and then manually build backlink by filtering out the relevant sites.

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There is nothing better than GSA SER as a link building tool.

Many competing tools have sprung up but none come even close to the power and flexibility of GSA.

ranksignals
ahrefs
megisticseo
backlinkwatch
these are all d some greatest backlink checking websites

just use ahref free and you can easily check your anchor text diversity .if you mean automated tool to build backlinks than make sure dont go for it .

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I agree with Jolly. It's always best to get backlinks to your website manually. Using a tool for this might get you in trouble. it's not a general rule, but why risk it, right?

Hi Mate,
There no trusted tool for backlinks. You have to do it manually. Its better.
Thanks.

Hi, Ahrefs is the best backlink checker tool I know. You can get complete and exact data of your competitors links through this tool. I am use its free as well as paid version.

I would also recommend GSA SER for link building. However, it can be dangerous if you're not careful though. If you're serious about your site lasting a long time, opposed to "churning and burning" a website, then you need to make sure everything looks natural in the eyes of Google. In some cases you may be better off manually building backlinks and/or PBNs, etc.

Are you looking to build links or check backlinks? Because with Ahrefs of another backlink checking tool you can uncover a goldmine of where to build links by looking at sites that are already ranking well.