
Description: Zimbra Desktop is an open source email and calendar client that connects to Zimbra Collaboration servers. It provides access to email, contacts, calendar, tasks, and notes across multiple accounts in one interface.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Mailspring is an open-source email client for personal use. It aims to provide an interface that is both intuitive and feature-rich for managing your email effectively.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API