NethServer is an evolution of SME Server, which updates the technical foundations while maintaining the core principles: easy to configure, stable and secure.
NethServer is built by a group of experienced SME Server users, it's open and released under the GPL.
While many core features are unchanged, the server-manager interface is new, modern and user friendly.
NethServer 6.4beta1 has been released yesterday.
It's already used in production, even if it's still named beta, because some features still need more field testing.
More informations can be found on the project website:
nethserver.nethesis.it