
Description: Zentyal is an open source Linux server that offers a variety of network services, including DHCP, DNS, HTTP proxy, firewall, VPN, mail, viruses blocking, gateway, unified threat management, LDAP directory, Samba file server, and certification authority.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Sendmail is a widely used open-source mail transfer agent (MTA) for routing and delivering email on Unix and Linux systems. It handles routing emails between mail servers and delivers them to local users' mailboxes.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API