Linux Schools is described as 'consists of Karoshi Server and Karoshi client. It is an Ubuntu LTS Server based solution especially designed for educational environments. It is a fully modular and scalable distribuition, mainly written in Bash' and is an app in the Education & Reference category. There are four alternatives to Linux Schools for Linux and Windows. The best alternative is Zentyal. It's not free, so if you're looking for a free alternative, you could try ClearOS or SME Server.
Zentyal is a native Microsoft Active Directory implementation on Linux incorporating all the network services required in a small and medium business environment: Directory & Domain Server, Mail Server, Gateway and Infrastructure Server.
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.
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.
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.