
Description: Flute Mail is an open-source email client focused on simplicity and ease of use. It has a clean interface, support for multiple accounts, basic email features like contacts, calendar, and tasks. It is lightweight, customizable, and available on Windows, Mac, and Linux.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: SparkPost is an email delivery service that focuses on delivering high volumes of email easily and reliably. It provides email infrastructure and services to help companies optimize their email programs.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API