
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: Postbox is an email client for Windows and macOS that provides a clean, easy-to-use interface for managing multiple email accounts. It supports POP3, IMAP, Exchange, Gmail, Outlook.com, Yahoo and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API