Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.
SaaS Pages - 900+ Screenshots of the best SaaS landing pages
MJML - The open source framework for responsive emails
Landing Pages in MailChimp - Easy to build, custom landing pages for free
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
Good Landing Page - Curated landing page examples for design inspiration