The Landing Page Cookbook - A guide for makers who want to create better landing pages.
Textalyzer - Analyze text readability and SEO parameters
Landing Pages in MailChimp - Easy to build, custom landing pages for free
Dareboost: Website Speed Comparison - Check how fast your website is against your competitors
SaaS Pages - 900+ Screenshots of the best SaaS landing pages
Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.