1. Mozbar (Free)
It provides valuable metrics about a website and its link profile for Search Engine Optimization (SEO) purposes. Features: View tags on a page (title, description, anchors, Hx, image, alt text, etc),Show nofollow links,Check HTTP status code on the fly,View canonical tag etc.
2. SEO Site Checkup (Free)
Optimize & monitor your website's performance. Free on-page SEO tools, you can instantly check to make sure your on-page SEO is correct and it also prvides a number of tips on what can be done to improve the user experience.
3. PageSpeed (Free)
The PageSpeed family of tools is designed to help you optimize the performance of your website. PageSpeed Insights products will help you identify performance best practices that can be applied to your site, and PageSpeed optimization tools can help you automate the process.
It gives you a comprehensive analysis on SEO, keywords, social, links, content and even competitor comparisons.
5. BROWSEO (Free)
BROWSEO is a web app that allows you to view any webpage without distractions caused by styles. It also highlights parts of a page that are relevant for SEO.See SEO stats for a web page, as well as how a search engine views the page.Just enter a URL to get started!
6. Screaming Frog (Paid)
Run a full crawl of a site.The Screaming Frog SEO Spider allows you to quickly analyse, audit and review a site from an onsite SEO perspective. It’s particulary good for analysing medium to large sites where manually checking every page would be extremely labour intensive (or impossible!) and where you can easily miss a redirect, meta refresh or duplicate page issue.
7. Authority Labs (Paid)
Easily add domains or pages to be tracked from any country and language offered by Google, Yahoo! and Bing.Save time and money by automating your campaign monitoring, local rank tracking, and competitor tracking.
8. Raven Tools' Research Central (Paid)
You can view authority, ranking, keyword, social and link metrics for a URL.Raven speeds up SEO tasks & quickly research websites,organize outreach,monitor competitors and more.
9. Site Condor
Great overview of SEO issues.Slice, dice & search aggregated results to uncover issues and optimization opportunities.
10. Moz SEO tools
Moz offers a range of advanced SEO tools to meet all your SEO requirements. There are 100 free tools as well. Apart from that you can try the premium tools on a one-month free trial.
11. Google Analytics (Free and premium)
Google Analytics is one of the coolest SEO tool any marketer can have. It tracks everything about your site visitor, session, traffic, and conversion for both desktop and mobile.
12. Clicky (Free)
Clicky is a web analytics tool for SEO managers. This tool monitors, analyzes, and tracks your website traffic and visits in real time.
13. Agency Analytics
Earlier it was My SEO tools. Recently, this company re-branded themselves to Agency Analytics. It’s a reporting tool for SEO that also does detailed SEO analysis such as tracking search results, doing site audit, tracking keyword rankings, monitoring back-link quality, optimizing webpages, and analyzing competition.
SEMrush is a cool tool that analyzes your SEO and PPC health on one dashboard. You can monitor your high-performing and low-performing keywords for both SEO and PPC. Apart from that, it’s also a great tool for competition analysis.
The tool is backed up by the largest backlink index in the world, which is updated every 15 minutes. The tool has its own crawler to ensure you get the fresh information.
Check how your web page appears to search engines.
WebMasterWorld offers different set of tools for SEO, social media, PPC etc. For SEO, you can check your keyword and meta descriptions of your web pages. You also can test page speed and link health with these tools.
18. Deep Crawl
Crawls test environments and compares them to your live site, reviews canonicalized pages, reviews pages that search engines might consider low-quality + more. Works well for large sites.
19. Botify: Besides analyzing, it also helps you share the SEO report with your team members + more features.
20. Brightlocal: For better local search decisions.