
Description: Zimbra Collaboration Suite is an open source email and collaboration platform. It includes email, contacts, calendar, document management, and other collaboration tools. Zimbra is designed for enterprises and service providers.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Poste.io is an open-source newsletter service that allows users to easily create, send, and manage email newsletters. It has a simple drag-and-drop editor to design newsletter templates and customizable subscription forms to grow mailing lists.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API