
Description: Postler is an open-source desktop email client for Windows, Mac, and Linux. It has support for multiple accounts and email providers like Gmail, Outlook, Yahoo Mail, and iCloud. Key features include customizable themes, powerful search tools, email scheduling, read receipts, and offline access.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Microsoft Mail and Calendar is a free email and calendar service developed by Microsoft. It comes included with Windows 10 and integrates well with other Microsoft products and services.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API