
Description: Nylas Mail Lives is an open-source email client built with React and Flux. It aims to deliver a fast, extensible, open-source email experience. Key features include integration with popular calendars and tools, unlimited custom plugins and themes, a powerful SDK, end-to-end encryption options, and more.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: K-9 Mail is an open source email client for Android focused on security and privacy. It supports multiple accounts, search, tagging, notifications and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API