1. Openfiler NAS and SAN
Openfiler is a full-fledged NAS/SAN appliance (or IP storage gateway) that can be downloaded as a virtual appliance for VMware and Xen hypervisors directly from openfiler.com. Openfiler offers storage administrators a set of powerful tools that are used to manage complex storage environments. The product brings reliability to storage with support for both software and hardware RAID, monitoring and alerting facilities, and volume snapshot and recovery features.