Zentyal (formely eBox Platform) is an open source unified network server (or an Unified Network Platform) for SMEs

Zentyal (formely eBox Platform) is an open source unified network server (or an Unified Network Platform) for SMEs. Zentyal can act as a Gateway, Network Infrastructure Manager, Unified Threat Manager, Office Server, Unified Communications Server or a combination of them. Besides, eBox Platform includes a development framework to ease the development of new Unix based services.
The project's source code is available under terms of the GNU General Public License, as well as under a variety of proprietary agreements. Zentyal is owned and sponsored by a single for-profit firm, the Spanish company eBox Technologies S.L., which holds the copyright to the codebase.
Zentyal (formely eBox Platform) development was first published in 2005 as an open-source, collaborative project of two companies.On 16 November 2006 eBox was officially approved as a NEOTEC project, receiving public funds from the CDTI (a Spanish public organisation, under the Ministry of Industry, Commerce and Tourism) to complete the development of version 1.0.eBox was first included in Ubuntu in 2007, in the Gutsy Gibbon Tribe 3, the third alpha release of Ubuntu 7.10.The first stable release candidate, eBox 1.0, was published in 2008.

^{Updates (via Distrowatch):}

José Antonio Calvo has announced the availability of a new beta release of Zentyal 2.2, an Ubuntu-based server distribution for small and medium-sized businesses: "The development team of Zentyal, the Linux small business server previously know as eBox Platform, is glad to announce that the second Zentyal 2.1 beta installer (Zentyal 2.1-1) is now available for download. This version includes all the current development improvements for Zentyal 2.2 and the first beta of the new IPsec module. Zentyal 2.1 is a development version based on Ubuntu 10.04.2 and it will become Zentyal 2.2, next stable release, in September 2011. Until then, the Zentyal Development Team will frequently release new beta versions with new features and improvements that you can help testing."

Please refer to the release announcement for further details.

Download the installation CD images from here: zentyal-2.1-1-i386.iso (565MB, MD5), zentyal-2.1-1-amd64.iso (527MB, MD5).

Recent releases:

• 2011-05-13: Development Release: Zentyal 2.1-1 Beta
• 2011-02-22: Development Release: Zentyal 2.1 Beta
• 2010-12-23: Distribution Release: Zentyal 2.0-3
• 2010-09-01: Distribution Release: Zentyal 2.0
• 2010-08-08: Distribution Release: eBox Platform 1.5-1
• 2010-07-26: Distribution Release: eBox Platform 1.5

Networking
- Firewall and routing
  - Filtering
  - NAT and port redirections
  - VLAN 802.1Q
  - Support for multiple PPPoE and DHCP gateways
  - Multi-gateway rules, load balancing and automatic failover
  - Traffic shaping (with application layer support)
  - Graphical traffic rate monitoring
  - Network intrusion detection system
  - Dynamic DNS client
- Network infrastructure
  - DHCP server
  - NTP server
  - DNS server
    - Dynamic updates via DHCP
  - RADIUS server
- VPN support
  - Dynamic routes autoconfiguration
- HTTP proxy
  - Internet cache
  - User authentication
  - Content filtering (with categorized lists)
  - Transparent antivirus
  - Delay pools
- Intrusion Detection System
- Mail Server
  - Virtual domains
  - Quotas
  - SIEVE support
  - External account retrieval
  - POP3 and IMAP with SSL/TLS
  - Spam and antivirus filtering
    - Greylisting, blacklisting, whitelisting
  - Transparent POP3 proxy filter
  - Catch-all account
Webmail
Web server
- Virtual hosts
Certification authority
Workgroup
- Centralized users and groups management
  - Master/slave support
  - Windos Active Directory Synchronization
- Windows PDC
  - Password policies
  - Support for Windows 7 clients
- Network resource sharing
  - File server
    - Antivirus
    - Recycle bin
  - Print server
- Groupware: calendar, address book, webmail, wiki, etc.
- VoIP server
  - Voicemail
  - Conference rooms
  - Calls through an external provider
  - Call transfers
  - Call parking
  - Music on hold
  - Queues
  - Logs
Jabber/XMPP server
- Conference rooms
Zentyal User Corner for self users info updating
Reporting and monitoring
- Dashboard for centralized service information
- Monitor CPU, load, disk space, thermal, memory
- Disk usage and RAID status
- Summarized and full system reports
- Event notification via mail, RSS or Jabber
Software updates
Backups (configuration and remote data backup)