
Description: Marble is a drag-and-drop email design software that allows anyone to easily create beautiful, responsive email templates without coding. It has an intuitive, user-friendly interface for quickly building and testing emails with custom web fonts and flawless rendering.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Klaviyo is an email marketing and automation platform that helps ecommerce companies segment customers, create targeted email campaigns, and track results. It integrates with ecommerce platforms like Shopify and allows granular customization of emails.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API