TemplateMo - TemplateMo is a great place to get bootstrap templates from your website, which are all HTML5 supported with CSS layout.
Ethereum Syllabus - A complete Ethereum learning track, packed with resources
Ethereal by HTML5 UP - A fully responsive side-scrolling one-page HTML5 template
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UIdeck - Landing Page HTML Templates and UI Kits
Pragma - The home base for Ethereum developers.