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.
NethServer vs Zentyal opinions
I used for my personal mail server e nextcloud.
Moreover I used it with BgLUG (http://bglug.it/scuole) in our project "Linux in the schools" as Primary Domain Controller on the servers of the IT Lab of the schools.
Very nice distribution: efficient and easy to use.
very very simple to configure
better alternative than 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.
ClearOS vs Zentyal opinions
The web interface is more intuitive and easier. and it has more features. Although it has not the option as Exchange server. But that is to me a minor thing. You can add that separately afterwards.
They both provide the same functions...I use them both
it is more robust than zentyal
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.
Univention Corporate Server is a pre-configured platform to operate and manage server applications and complete IT infrastructures free of charge. It is optimal to provide Microsoft Server-like services on the cloud or on premises, to run and operate corporate IT environments...
Univention Corporate Server vs Zentyal opinions
Easy management of multiple servers from one central console. For example easy setup of mail-backup servers. And more.
SambaBox is an integrated enterprise domain appliance which works flawlessly with Windows AD environment. SambaBox offers, Integrated DNS, DHCP, CA and SaltStack with web based management on hight secure environment.
SambaBox vs Zentyal opinions
It has more tuning settings
The Amahi Home Server is designed for home and small office environments where the technical support staff do not want the job!
Amahi Home Server vs Zentyal opinions
less features, zentyal had a lot more features, Amahi is outdated
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.
Microsoft Exchange Server vs Zentyal opinions
Exchange is only for email and calendar.
Save time and money with 100+ ready-to-use solutions that include a Debian based OS, and the relevant open source software and all dependencies pre-installed. Discover and leverage the best free open source software.This app doesn't have any features at the moment.
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.
Windows Server 2012 vs Zentyal opinions
the only thing different: it is full windows
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.