OpenMediaVault

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OpenMediaVault is based on the Debian Linux distribution. It is licensed through the GNU General Public License v3 as published by the Free Software Foundation. OpenMediaVault uses Debian's official standard for package management, the Advanced Packaging Tool (APT). OpenMediaVault is designed to be configured and administered via the Webinterface, which is written in Ext JS, and is currently compatible with 32 and 64bit hardware

Features
Through an Application programming interface (API), OpenMediaVault is designed for features to be added to the Webinterface via the Plug-in System. The developer provides a group of core Plug-ins that can be installed via the Webinterface, while others are developed by the community. Many of the community supported Plug-ins are currently hosted in an unofficial plugin repository.

Other features include:

Multi Language web based graphical user interface (GUI)
Protocols: CIFS (Samba), FTP, NFS (Version 3 and 4), SSH, rsync, iSCSI, AFP and TFTP
Software-RAID with the RAID-Level 0, 1, 4, 5, 6 and 10 plus JBOD
Monitoring: Syslog, Watchdog, S.M.A.R.T., SNMP (v1/2c/3) (Read-Only)
Statistic reports per E-Mail
Statistic graphs for the CPU-workload, LAN transferrates, hard disk usage and RAM allocation
GPT/EFI partitioning >2 TByte possible, ext4 maximal 16TiB
Filesystems: ext2, ext3, ext4, XFS, JFS, NTFS, FAT32
Quota
User and group management
Access controls via ACL
Link Aggreggation Bonding, Wake On LAN
Plug-in system
Plug-ins
Core Plug-ins are developed by Volker Theile

ClamAV - Antivirus software
Digital Audio Access Protocol - provides audio files in a local network (also for iTunes)
SAN and iSCSI - blockbased access datastores over the network
Lightweight Directory Access Protocol - Information request and changes of an Directory service
Logical Volume Manager - enables the possibility to create and administrate dynamic partitions
Netatalk - File-, time- and printserver for Apple Macintosh
Plug-in to support the use of an Uninterruptible power supply
easy changes to the Routing tables
Plug-in, which allows (automatic) backups to external USB hard disks
External Plug-ins are available via additional package repositories. The majority of those Plug-ins are developed by a group called OpenMediaVault Plugin Developers. The status of all Plug-ins can be viewed online.

Referencia: http://en.wikipedia.org/wiki/OpenMediaVault