
Description: Delta Chat is a free and open source email app that allows users to send and receive end-to-end encrypted emails. It uses email standards like SMTP and IMAP to communicate between users on different servers and systems.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: FairEmail is an open source, privacy-focused email app for Android. It supports multiple accounts, end-to-end encryption, and blocks trackers and ads. FairEmail is lightweight, customizable, and respects user privacy.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API