
Description: PostSeal is an open source secure mail client, a viable open source alternative to ProtonMail. It offers end-to-end encryption, fully anonymous messaging, cross-platform support, and no cost. It protects user privacy and data.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Mail A Letter is a simple software that allows users to write physical letters from their computer and have them printed and mailed via postal service. It has a clean interface for composing letters, inserting addresses, selecting stationary and stamps.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API