HTMLEmail.io - Responsive HTML email templates for startups & developers
Top Instagram Influencers Ranking - Curated directory of Instagram bloggers by country&category
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
The Influencer Marketing Stack - Free resources to launch a killer campaign
MJML - The open source framework for responsive emails
Insense & Paid Media - Find creators for short-term and long-term partnerships