MJML - The open source framework for responsive emails
SmartMetrics - We monitor, analyze, and fix your Google Analytics, Search, SEO, and Ads metrics daily to provide you with better insights and more accurate data.
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.
Minter.io - Instagram Analytics. Twtitter Analytics. Facebook Analytics
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
Union Metrics - Union Metrics builds social analytics tools for brands and agencies.