
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: Mutt is a free, open source email client for Linux, Unix, and macOS systems that emphasizes speed, flexibility, and security. It supports features like keyboard shortcuts, threading, PGP encryption, and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API