Ahrefs This tool specializes in link analysis. Users enter their desired URL to see the number of backlinks attached to it, as well as each one’s type (e.g. text, no-follow, redirect, image or frame), referring IPs and domains.
SEO Book With both free and premium webmaster tools, SEO Book offers a massive suite of capabilities, including a keyword suggestion tool, keyword list generator, keyword list cleaner, a meta tag generator, a link suggestion tool, keyword density analyzer, a page comparison tool and even a typo generator, among many others.
WooRank Users can run a free website review with this tool, which then provides them with tips on how to improve their SEO efforts and even find the right SEO company for their needs.
SEO Doctor SEO Doctor is a Firefox extension that provides users with a brief overview of their site by looking at all of the elements that pertain to search engine optimization. It then alerts the user of where improvements need to be made to improve its rank based on the current algorithm requirements.
Alexa This is a popular free Web analytics solution that lets users study their websites to see how well it meets SEO standards. Compete: Compete helps you to monitor your online competition, benchmark your performance against your industry, and discover new business opportunities.
Ranks.nl If you’re just looking to check the keyword density of a page on your site, Ranks.nl is a great tool. And in addition to its Keyword Density Analyzer, it also has an Article Analyzer, Keyword Proximity Analyzer, Search Engine Comparison Tool and other useful SEO solutions.
Microsoft SEO Toolkit Microsoft SEO Toolkit as Bing’s answer to all of Google’s comprehensive webmaster and keyword tools. It analyzes websites based on Bing’s search engine algorithm, and it can tell users how fast their websites are so that they can know if it is performing up to par.
getRank This is a pretty comprehensive suite of SEO tools for not just search engine optimization, but also website analysis and research. getRank tools include website rank checkers, link tools, keyword tools, header/tag tools, search engine tools, IP tools, source code tools and many more.
SEMRush With the free version of SEMRush, users can input up to 10 queries a day. The solution analyzes domains and returns a listing of organic keywords, potential competitors, ad suggestions and more.
SEOCentro Here is a suite of SEO tools that can analyze meta tags, link popularity, page rank, keywords positions, search engine saturation, page keywords and keyword density, and also offer users keyword suggestions.
SEOquake SEOquake is great because it works seamlessly with all of the major Web browsers, including Chrome, Firefox and even Internet Explorer. The tool will gather information about a user’s Web pages and then arrange them by priority, which is decided by the keyword density of each page. SEOrush SEOrush provides an opportunity for users to get a free report on their URLs, as well as the URLs of their competitors. It will provide them with on-page SEO and off-page SEO analysis, plus information on their social presence, indexed pages, validation, meta information, standard domain information and rankings.
SEMrush Important SEO data, earch engine rankings and spy on your competitors. Must have on your SEO tool arsenal. LinkVendor Users can quickly and efficiently evaluate their SEO practices and social visibility with LinkVendor’s suite of Web analysis, keyword server, domain and, of course, link tools, among others.
Xenu Xenu’s Link Sleuth tool works like a spider and analyzes a website to see if it has endless loops, broken links, redirect detections and much more.
BROWSEO After users simply enter the URL they want to check out, BROWSEO will create a “search engine version” of the site that lets them see the site the same way Google does when it’s crawling it, so that they can identify the faults and see what needs added, subtracted or enhanced on their site.
SEOmoz One of the more comprehensive suites of SEO tools on the Web belongs to SEOmoz. Though it’s one of the few paid packages on the list, it can certainly be worth the money if one is in need of a heavy-duty SEO solution. Users can analyze keywords, research backlinks, do on-page analysis, identify accessibility issues and track their rankings from within one easy-to-use platform.
GTMetrics: analyze and test page speed online.
CuteRank: Free keyword rank checker software that batch checks keyword position automatically.
IFTTT Put the internet to work for you.
KeywordDensityFree tool to help you find the most common words and phrases on a page.
LSISemanticsLatent Semantic Indexing. Now LSI Keywords will let you use Latent Semantic Indexing
MoreSitesLike MoreSitesLike helps you find similar sites, related to sites topics.
Nw360 Web-based version of News360 – a popular cross-platform newsreader, that gives you personalized news feeds based on your social web activity.
SEOMoz Find tools to help you conduct keyword research, track your social media, optimize your local business listings, and more.
Text Case Converter is a free online tool that converts any text to either uppercase, lowercase, propercase or sentence case. Simple, quick and easy to use!
Hashtagify.me Find the best Twitter hashtags to reach your audience. Search their relations and influencers with the most advanced Twitter Hashtags Search Engine.
Ubersuggest Get thousands keywords ideas in a minute with this amazing keyword suggestion tool: Übersuggest is Google Suggest on steroids!
Social Mention Social Mention is a social media search engine that searches user-generated content such as blogs, comments, bookmarks, events, news, videos, and microblogging services.
BadLinkCheck Free Broken Link Checker / Online URL Validator – find bad / dead hyperlinks
dlvr.it dlvr.it helps publishers deliver their content to the social web, including twitter and facebook.
XmarksOffers bookmark synchronization, search enhancement and web discovery based on sites bookmarked by users.