Web development:
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HTML5 UP: Responsive HTML5 and CSS3 site templates.
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Bootswatch: Free themes for Bootstrap.
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Templated: A collection of 845 free CSS & HTML5 site templates.
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WordPress.org | WordPress.com: Create your new website for free.
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Strikingly: Free, unlimited mobile optimized websites for strikingly domains.
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Layers: A WordPress site builder so simple. It’s free, forever.
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Bootstrap Zero: The largest open-source, free Bootstrap template collection.
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Landing Harbor: Promote your mobile app with a free landing page.
Website analysis and SEO:
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Ahrefs: Site explorer & backlink checker.
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Quick Sprout: Complete analysis of your website.
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WordPress SEO by Yoast: Have a fully optimized WordPress site.
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SEO Site Checkup: Check your website’s SEO problems for free.
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Hubspot Marketing Grader: Grade your marketing.
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SimilarWeb: Analyze website statistics for any domain.
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Alexa Ranking: Analytical insights to analyze any site’s rank.
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SERPs Rank Checker: Free keyword rank & SERP checker.
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OpenLinkProfiler: The freshest backlinks, for free.
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Keywordtool.io: Free alternative to Google Keyword Planner.
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Nibbler: Test any website.
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Browseo: How search engines see your website.
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Broken Links: Find broken links, redirects & more.
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Copyscape: Search for copies of your page on the web.
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Google Pagespeed Insights: Check the performance of your site.
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Pingdom: Test & the load time of a site.
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GTMetrics: Analyze your page’s speed performance.
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Moz Local: Check your local listings on Google, Bing, and others.
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XML Sitemaps: Sitemap generator that creates XML & HTML variants.
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Shopify E-commerce Report: Get your free Ecommerce report.
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W3C validator: Easy-to-use markup validation service.