ahrefs!

Serpstat is an all-in-one SEO platform for Marketers, SEO and PPC specialists and business owners. It has 4 powerful tools: - Keyword and Competitors Research in organic and paid search with the most biggest and updatable database of keywords in your region; Rank tracking; Unlike other rank tracking services on the market, it keeps track of all top 100 search results for a keyword, and not only the rank of one domain for the tracked keyword. Serpstat users benefit from this unique feature by gaining insight into exact positions of all top 100 domains for a keyword without the need to create separate projects for monitoring competitors’ ranksBacklink tool; Full backlinks data collected over the last 2 years. Serpstat saves data on all changes that happen to a domain's link profile: referring domains and pages, anchors and more.SEO Audit; Serpstat`s unique SDO score shows how well your web site optimised and allows you to compare the quality of your website's optimization to the quality of your competitors'optimization. »

HubSpot is the world’s leading inbound marketing and sales platform with 15,000 customers in more than 90 countries.

Google Webmaster Tools provides you with detailed reports about your pages' visibility on Google. See how Google crawls and indexes your site and learn about specific problems we're having accessing it. View, classify, and download comprehensive data about internal and external links to your site with new link reporting tools. Find out which Google search queries drive traffic to your site, and see exactly how users arrive there.

Link intelligence tools for SEO and Internet PR and Marketing. Site Explorer shows inbound link and site summary data.

SEMRush is competitor research keyword tool with a regularly updated database of over 88 million of the most expensive keywords used to drive traffic to websites through Google Adwords and Google’s organic search results. You can use SEMRush to identify organic search and AdWords opportunities, as well as seeing which keywords are driving the most traffic to your competitors.

KWFinder - Find long tail keywords with low SEO competition.

SEO Tools Centre provides SEO checker services for websites. Here you will find different types of SEO tools: backlink checker, article rewriter, keyword position checker and many others useful services!

Site Explorer allows you to explore all the web pages indexed by Yahoo! Search. View the most popular pages from any site, dive into a comprehensive site map, and find pages that link to that site or any page.

Data mining tool for SEO specialists and marketers. Marketing Miner is a tool for automated extraction of data that is important for online marketing of web projects. It consists of miners that provide data extracting based on user`s input dataset.

Build and Manage Online Marketing with Raven's SEO Tools and Social Media Tools. Perform Keyword Research for SEO and Report on Social Media Growth all within one interface.

Boost traffic and revenue with an SEO Backlinks Keywords and Competitor analysis tools. Discover new opportunities to find, reach, and convert your audience.

The first LSI keyword research tool for SEO and PPC marketing that can sort and filter by relevance, user intent, search volume, and more. An alternative and better option than Google Keyword Planner. Keyword tools often give too many unrelated keywords, forcing you to manually remove or ignore unrelated keywords. So, we developed a tool to filter unrelated keywords.

Backlinko is the place for next-level SEO training and link building strategies.

Drive more visitors to your site using Bing data on search queries, crawling and search traffic.