XigmaNAS is an open source NAS / OS software appliance
OviOS Linux
Backup and replicate Linux files, databases and ©VMWare ©ESXi VMs
Zabbix extension that reports various HDD status using various tools
SMF service wrapper for VirtualBox under Solaris 10+ and OpenSolaris.
Provision VMs in QEMU, using ZFS clones for virtual disks
Minimal and slim Raspbian for Raspberry Pi
OpenNAS is a storage appliance based on FreeBSD.
An open source version of istgt
jiSCSI is iSCSI initiator/client built in java.