The Landing Page Cookbook - A guide for makers who want to create better landing pages.
TemplateMo - TemplateMo is a great place to get bootstrap templates from your website, which are all HTML5 supported with CSS layout.
Landing Pages by Viral Loops - Easily create a landing page for your referral campaign ✌️
Ethereal by HTML5 UP - A fully responsive side-scrolling one-page HTML5 template
Landing Pages in MailChimp - Easy to build, custom landing pages for free
UIdeck - Landing Page HTML Templates and UI Kits