
Description: Substack is an email newsletter platform that allows writers and publishers to easily create, design, and distribute email newsletters. It aims to let freelance writers and bloggers build direct relationships with readers.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Revue is an email newsletter creation and distribution platform. It provides professional templates, custom domains, social sharing, basic subscriber analytics, and scheduled sending for content creators and businesses to easily create beautiful newsletters and grow their subscriber lists.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API