Ahrefs are trusted by SEO’s all around the world and they even have an extensive library for all aspects of SEO including the best link building techniques.

Ahrefs.com is also a well-known toolset for backlinks and SEO analysis which will analyse your website for common SEO issues & monitor your SEO health over time.

Moz Pro is a popular all-in-one SEO software suite that contains tools designed to improve search engine visibility. Key features include Link Explorer, Keyword Explorer and Rank Tracker.

A Moz Pro subscription includes: access to site tracking with Campaigns, where you can learn how your site health, link building, and keyword performance impact your SEO success; Research Tools that analyze your competitors’ efforts, support your keyword research process, and show you new opportunities for link building outreach; and a wealth of resources for learning SEO and inbound marketing.

A full suite of all-in-one SEO tools with a free account option that works well if you only work with a single website.

The list of tools which semrush provides: Keyword Research, On-page SEO, Competitor Analysis, Content Marketing, Local SEO, Rank Tracking, Social Media Management, Link Building, Competitor SEO Analysis, Content Creation and Distribution, Content Optimization, Content Marketing Analytics, Market Analysis, Paid Advertising, Competitor PR Monitoring, PPC Keyword Research and Website Monetization.

KWFinder is a super-effective tool for finding easy-to-rank keywords and has lots of the features that other tools have. It's just one part of the Mangools Suite, which actually contains five resources: KWFinder (Keyword Research), SERPChecker (SERP Analysis), SERPWatcher (Rank Tracking),  LinkMiner (Backlink Analysis), SiteProfiler (SEO metrics & Insights).

KWFinder keyword difficulty is (one of) the most accurate on the market. Many case studies prove the fact that by using it, your keyword research will be based on relevant data you can trust.

Ubersuggest tool is created by an Italian SEO professional and recently acquired by entrepreneur Neil Patel, it is a free keyword suggestion tool, which helps in leveraging Google suggest and other suggest services.

It also helps users in excerpting key phrases and suggests keywords, which later gets displayed in the list format and can further be used by the user.

SEOquake is a free plugin for all popular browsers that provides you with key SEO metrics for a specific page, along with other useful tools such as SEO Audit and many others.

Things which you can easily do with SEOQuake are: Conduct on-page SEO Audit, Examine internal and external links, Compare domains and URLs in real time and Export all data into a file.

The Screaming Frog SEO Spider is a small desktop application you can install locally on your PC, Mac or Linux machine. It crawls a websites' links, images, CSS, etc from an SEO perspective. It basically tells you what a search spider would see when it crawls a website.

Screaming Frog is one of the most popular SEO Spider Tool which gathers key onsite data to allow SEOs to make informed decisions.

BuzzSumo is a cloud-based platform that helps you discover the best engagement, content and outreach opportunities across social and search. Discover new keywords, trending stories, customer questions and content success, all while monitoring what's most important to your brand.

Millions of marketers rely on BuzzSumo to reveal the truth about what content works and what sinks without a trace. The four major components are: Discovery, Research, Influencers and Monitoring.

Majestic maps the web to bring you the Link Intelligence data that you need to dominate your market. Enjoy award-winning data from one of SEO's most established brands.

The Majestic API empowers agencies, specialists and consultancies to build time-saving bespoke apps. The great thing about Majestic is just that the amount of data that you get and the amount of data points that you get is just completely unparalleled, and taking information out is a very clean and easy thing to do. There's a ton of connectors where you can literally just click a button and it's there.

SpyFu is one of the best known names in the SEO game due to a deep feature set, excellent reporting, and solid support for digital marketing and advertising. While it might be a bit complex for novices, it remains an excellent pick for Editors' Choice.

SpyFu makes it very easy to compare your own website with competitors, seeing which keywords we're missing, and where you can improve. Over the month of using SpyFu, you can even seen SERP ranking increase by an average of 2 places for landing page.