Zentyal!

ClearOS is a family of operating systems for the enterprise, small business, and home. There are three editions to choose from depending on your needs and suitable to your abilities. They are: ClearOS Enterprise, ClearOS Home, and ClearOS Core.

NethServer is a CentOS-based Linux distribution for servers. The product's main feature is a modular design which makes it simple to turn the distribution into a mail server and filter, web server, groupware, firewall, web filter, IPS/IDS or VPN server. It also includes a comprehensive web-based user interface that simplifies common administration tasks and enables single-click installation of several pre-configured modules. NethServer is designed primarily for small offices and medium-size enterprises. »

Univention Corporate Server is a pre-configured Linux server operating system free of charge. It's the best fit to provide Microsoft Server-like services on the cloud or on the premises, to run and operate corporate IT environments with Windows- and Linux-based clients and to extend those environments with proven enterprise software, also either on the cloud or on the premises.

Save time and money with 45+ ready-to-use solutions. Discover and leverage the best free open source software. Deploy in minutes to VMs, the cloud, and bare metal

Windows Server 2012, codenamed "Windows Server 8", is the sixth release of Windows Server. It is the server version of Windows 8 and succeeds Windows Server 2008 R2. Two pre-release versions, a developer preview and a beta version, were released during development. The software was generally available to customers starting on September 4, 2012.

The Amahi Home Server is designed for home and small office environments where the technical support staff do not want the job!

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure solutions. Exchanges major features consist of electronic mail, calendaring, contacts and tasks; support for mobile and web-based access to information; and support for data storage.

Untangle is a platform for deploying network based applications. The platform unites these applications around a common GUI, database and reporting. Applications on the Untangle platform inspect network traffic simultaneously, which greatly reduces the resource requirements of each individual application. Untangle can act as a complete unified threat management (UTM) box, going beyond just a basic firewall or router. It's aimed at small-to-medium businesses and enthusiast home users. It runs in line as a network gateway, so it allows control of all devices connecting to the network. Untangle offers a free, open source Lite Package as well as a full-featured, commercial Premium Package. Untangle has about 40,000 installations worldwide protecting over 2 million people in businesses, schools and other organizations. »

SME Server is a leading distribution for small and medium enterprises. It stands apart from the competition by shipping with most common functionality preconfigured and features a number of popular additional enhancements in the form of downloadable contributions. It is published under the GPL license.

Active Directory (AD) is a directory service that Microsoft developed for Windows domain networks and included in most Windows Server operating systems as a set of processes and services.

The Linux operating system for educational establishments.

Windows Server Essentials (formerly Windows Small Business Server) is a flexible, affordable, and easy-to-use server solution designed and priced for small businesses with up to 25 users and 50 devices. Windows Server Essentials is an ideal first server, and it can also be used as the primary server in a multi-server environment for small businesses. Download the Windows Server 2012 R2 Essentials evaluation.

Hosted Exchange solutions from Netrepid - the best hosted exchange provider. Accelerate your technology at on demand speed.