Below is a list of free SEO tools that may be helpful for checking the SEO value of your website and discovering problems that may be preventing your site from reasching the tops of the search engines...
1. Screaming Frog
What it does: Crawls a URL and diagnoses a number of technical issues
Tool type: Desktop app
Link: http://www.screamingfrog.co.uk/seo-spider/
2. Google – Search Console
What it does: Helps with almost everything you need as an SEO
Tool type: Website
Link: rel=”nofollow” https://www.google.com/webmasters/tools/home?hl=en
3. SEO Site Checkup
What it does: An entire suite of valuable free SEO tools
Tool type: Website
Link: http://seositecheckup.com/tools
4. Google – Analytics
What it does: Checks referral traffic, organic traffic, etc
Tool type: Website
Link: http://www.google.com/analytics
5. Mozbar – Canonical Check
What it does: Checks canonicalization of a web page
Tool type: Browser plug-in
Link: http://www.seomoz.org/seo-toolbar
6. Majestic SEO
What it does: Checks citation flow, trust flow, backlink analyzer
Tool type: Browser plug-in
Link: http://www.seomoz.org/seo-toolbar
7. Yext
What it does: Checks for local citation duplicates
Tool type: Website
Link: http://www.yext.com
8. HTTP Response Checker
What it does: Bulk HTTP response code test, includes which URL they are redirected to
Tool type: Website
Link: http://www.tomanthony.co.uk/tools/bulk-http-header-compare
9. Moz – Google Algorithm Updates
What it does: The best tracker of Google’s algorithm updates + explanations
Tool type: Blog post
Link: http://www.seomoz.org/google-algorithm-change
10. Search Latte
What it does: Checks the international SERPS
Tool type: Website
Link: http://searchlatte.com
11. SEO Site Checkup
What it does: Checks IP redirects to help solve duplicate content problems
Tool type: Website
Link: http://www.seositecheckup.com
12. Mozbar – Keyword checker
What it does: Checks keyword density and other on page factors
Tool type: Browser Plug-In
Link: http://www.seomoz.org/seo-toolbar
13. Open Link Profiler
What it does: Checks backlinks of a website
Tool type: Website
Link: http://openlinkprofiler.org
14. BuzzStream – Data Extractor
What it does: Checks meta description, title tag and keywords of a page
Tool type: Website
Link: http://tools.buzzstream.com/meta-tag-extractor
15. SEO Browser
What it does: Checks a website page from a search engine’s point of view
Tool type: Website
Link: http://www.seo-browser.com
16. Google – Page Speed Test
What it does: Checks to see the technical issues holding page optimal page load times
Tool type: Website
Link: https://developers.google.com/speed/pagespeed
17. SEO Mofo – Snippet Optimizer
What it does: Helps to optimize SERP CTR by showing you page title, metas, etc
Tool type: Website
Link: http://www.seomofo.com/snippet-optimizer.html
18. SEO SERP – Position Tracker (Multiple Sites)
What it does: Checks multiple sites for keyword rankings
Tool type: Chrome Browser Extension
Link: https://chrome.google.com/webstore/detail/ofoaoaloeipdofknnaapbmdddddioklg
19. Google – Rich Snippet Tester
What it does: Tests URLs to tell if they’re showing rich snippets in SERPs
Tool type: Website
Link: http://www.google.com/webmasters/tools/richsnippets
20. Motoricerca – Robots.txt Tester
What it does: Tests Robots.txt file
Tool type: Website
Link: http://tool.motoricerca.info/robots-checker.phtml
21. BROWSEO
What it does: Views any webpage without distractions caused by styles, highlights parts of a page that are relevant for SEO
Tool type: Website
Link: http://www.browseo.net
22. SERP Metrics
What it does: Checks search engine fluctuations over time period
Tool type: Website
Link: http://api.serpmetrics.com/flux
23. StatCounter
What it does: Checks your website’s market share in the SERPs
Tool type: Website
Link: http://gs.statcounter.com/#search_engine-US-monthly-201107-201207
24. SEOBook – Rank Tracker
What it does: Tracks rankings of multiple keywords from a browser plug-in
Tool type: Browser Plug-In
Link: http://tools.seobook.com/firefox/rank-checker
25. SEO Tools – Cloak Checker
What it does: Detects whether a website uses “cloaking”
Tool type: Website
Link: http://www.seotools.com/seo-cloaking-checker
26. Ontolo’s SERP Dominator
What it does: Checks the top 100 SERP results for the keywords you input
Tool type: Website
Link: http://ontolo.com/seo-serp-dominator
27. Google – Markup Help
What it does: Helps you create data markup for pages on your site (local business, reviews, etc)
Tool type: Website
Link: https://www.google.com/webmasters/markup-helper
28. Schema.org
What it does: Helps you create schema markup for your website
Tool type: Website
Link: http://schema-creator.org
29. Distilled – Video Sitemap
What it does: Helps you create a video sitemap for your website
Tool type: Google doc
Link: https://docs.google.com/spreadsheet/ccc?key=0AhK1-u_-nIZhdE5KdEFTYVJCN3M4Yk9Xb2pfY0hrQkE#gid=0
30. Geo Sitemap Generator
What it does: Helps you geberate a KML file to be used in multiple location SEO
Tool type: Website
Link: http://www.geositemapgenerator.com
31. NO Follow Simple
What it does: Checks which links on a page are follow vs no follow
Tool type: Browser Plug-In
Link: https://chrome.google.com/webstore/detail/nofollow/dfogidghaigoomjdeacndafapdijmiid?hl=en
32. Ping-o-Matic
What it does: Pings URL to search engines to notify them to index the page
Tool type: Website
Link: http://pingomatic.com
33. Moz – Local Search Check
What it does: Aids in a number of local search tasks like citation and listing checks
Tool type: Website
Link: https://moz.com/local
34. XML Sitemap Validator
What it does: Checks the validity of your site’s XML sitemap
Tool type: Website
Link: http://www.xml-sitemaps.com/validate-xml-sitemap.html
35. STAT Search Analytics
What it does: Checks the real time analytics of a website
Tool type: Website
Link: http://codex.getstat.com
36. The SEO Stack
What it does: A curation of freemium SEO tools (credit: Ben Hoffman)
Tool type: Website
Link: http://www.producthunt.com/@benhoffman_/collections/the-seo-stack
37. Social ADR
What it does: An easy way to promote your sites and boost your rankings
Tool type: Website
Link: http://socialadr.com