
Description: Poste.io is an open-source newsletter service that allows users to easily create, send, and manage email newsletters. It has a simple drag-and-drop editor to design newsletter templates and customizable subscription forms to grow mailing lists.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: hMail Server is an open-source email server for Microsoft Windows. It allows you to send and receive email using POP3, SMTP and IMAP protocols. Designed specifically for Windows platforms, hMail Server is easy to install and manage.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API