Top Alternatives to Zentyal

ClearOS is a robust Linux distribution serving as a comprehensive server solution for small to medium-sized businesses. It provides a unified platform for networking, gateway, and server functions with a user-friendly web-based interface.

Ubuntu Server is a robust and scalable open-source operating system specifically designed for server environments. It provides a stable and secure foundation for a wide range of applications, from cloud deployments and data centers to enterprise infrastructure and development platforms.

NethServer is a modular operating system optimized for small to medium businesses (SMBs) and branch offices. It offers a comprehensive suite of network services and unified threat management (UTM) capabilities, managed through an intuitive web interface. Built on CentOS, NethServer provides a stable and secure platform for essential IT infrastructure.

Turnkey Linux offers a vast library of pre-configured server images, simplifying the deployment of popular web applications, infrastructure services, and development tools. Built on Debian, these virtual appliances streamline setup on various platforms, including clouds, virtual machines, and bare metal.

Amahi Home Server is a free and open-source server system based on Fedora Linux, designed to simplify home networking and digital life. It provides easy-to-use solutions for file sharing, backups, media streaming, and application management within a home environment.

Univention Corporate Server (UCS) is a comprehensive operating system and identity and infrastructure management platform. Based on Debian, it provides powerful tools for managing servers, services, applications, and users in diverse IT environments. UCS is designed for flexibility, supporting on-premises, cloud, and hybrid deployments.

Microsoft Exchange Server is a robust mail and calendaring server designed for businesses of all sizes, providing enterprise-grade email, calendaring, and contact management capabilities.

Untangle offers a comprehensive network security solution combining firewall, VPN, threat prevention, and content filtering in a single, unified platform designed for small to medium businesses and distributed enterprises.

Windows Server 2012 is a powerful and versatile server operating system designed for modern businesses and data centers. It offers a wide range of features for infrastructure management, virtualization, networking, storage, and application development, providing a robust platform for on-premises, hybrid, and cloud environments.