24 Free and Easy SEO Tools

1. Google PageSpeed InsightsCheck the speed and usability of your site on multiple devices
2. Moz Local Listing Score
local business online look
3. Keyword tool.io
700+ keyword ideas based on a single keyword
4. Google Analytics
Complete web stats and search insights
5. Google Webmaster Tools + Bing Webmaster Tools
Constant website analysis, alerts, and error reports
6. Open Site Explorer
Comprehensive link analysis
7. Google Keyword Planner
Know what people search for
8. Google.com in an Incognito Window
Discover auto-fill opportunities
9. Google Trends
Changes in search volume for key terms
10. QuickSprout Website Analyzer
Full analysis of your website
11. Schema Creator
Uber-customize the way your search results appear
12. SimilarWeb
View site stats for any domain
13. SERPs Rank Checker
See where your site ranks for certain terms
14. XML Sitemaps
Build a sitemap
15. Browser
See your website the way a search engine sees it
16. SEO Site Checkup
Audit and score for your website
17. Searchmetrics Website Analyzer
Performance dashboard for search and social rankings 
18. Find Broken Links
Discover errors on your site
19. Ahrefs’ Site Explorer and Backlink Checker
Complete overview of your website, pages, and links
20. Copyscape
Check for duplicate content
21. Moz toolbar
22. Robots.txt Generator
23. Structured Data Testing Tool
24. Microsoft Free SEO Toolkit