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Pingdom is a web-based tool for monitoring website performance and availability. Their service is used by over 30,000+ users including startups and 60% of the Fortune 500 companies. Pingdom can help digital marketers understand the impact performance has on reach and sales, or web developers and devops teams to identify bottlenecks and monitor impact of their latest push to production.

With WebPageTest you can run a free website speed test from around the globe using real browsers at consumer connection speeds with detailed optimization recommendations.

GTmetrix is free, web-based website performance monitoring tool. With GTmetrix you can see how your site performs, reveal why it's slow and discover optimization opportunities.

SEO Site Checkup is a tool that can help you identify common technical SEO problems surrounding your website. When you test your site with SEO Site Checkup, you get awarded a score and a list of information on things to improve. The SEO Site Checkup includes Meta Title Test, Meta Description Test, Google Search Results Preview Test, Most Common Keywords Test, Keywords Usage Test, Keywords Cloud Test, Related Keywords Test, Competitor Domains Test, Heading Tags Test, Robots.txt Test, Sitemap Test, Broken Links Test, SEO Friendly URL Test, Image Alt Test, Inline CSS Test, Deprecated HTML Tags Test, Google Analytics Test, Favicon Test, Backlinks Test, JS Error Test and a Social Media Test. All of which can help you improve your overall search ranking.

SEO Tester Online is a web-based tool that lets you get a better understanding how search engines view your website. The tools gives you quick tips that you can act on to improve your over all search engine ranking.

SEO PowereSuite is a set of 4 tools provided in a package, Rank Tracker, SEO SpyGlass, WebSite Auditor and LinkAssistant. The Rank Tracker tool can be used to monitor all your search engine rankings in one place. While the SEO SpyGlass tool provides you with a huge number of links from the largest backlink index on the web. With the WebSite Auditor tool you automatically checks your entire website to make sure you instantly spot and fix any technical issues that can undermine your rankings. With the LinkAssistant tool you can manage all your link data in one convenient working area, instead of keeping track manually with spreadsheets. SEO PowereSuite is commercial software available for macOS, Linux and Windows.