Windows Server 2003 has been discontinued. Similar apps include Ubuntu Server, which is free and open source. Other options are Univention Corporate Server (UCS), Amazon Linux 2, Windows Server 2012 and Windows Server 2019. In total there are five Operating Systems like Windows Server 2003 for Windows, Linux, the web and self-hosting.
The leading platform for scale-out computing, Ubuntu Server helps you make the most of your infrastructure. Whether you want to deploy an OpenStack cloud, a Hadoop cluster or a 50,000-node render farm, Ubuntu Server delivers the best value scale-out performance available.
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UCS is the established on-premises and virtualization platform for operating Nubus, Univention's open-source Identity & Access Management—with a web portal, App Center, and comprehensive Active Directory functions.
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Amazon Linux 2 is a Linux operating system from Amazon Web Services (AWS). It provides a security-focused, stable, and high-performance execution environment to develop and run cloud applications. Amazon Linux 2 is provided at no additional charge.
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.
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Windows Server 2019 is built on the strong foundation of Windows Server 2016 – which continues to see great momentum in customer adoption.
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