
Description: Claws Mail is an open-source email client and news client for Linux and other Unix-like operating systems. It supports features like SSL/TLS encryption, spam filtering, multi-account management, and custom themes.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

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: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API