Real Time Logic has released a free demo version of the BarracudaDrive application server for NSLU2 and the Unslung Linux firmware.
BarracudaDrive is a secure application server with an integrated scripting language, database engine, WebDAV server, Web File Manager, very small SSL server, HTTPS tunnel, and various SLL VPN clients for the HTTPS tunnel. BarracudaDrive is assembled by using the various plugins from the Barracuda Embedded Web Server. An application server, which should not be confused with a web server, is an operating system that can load and start auxiliary applications.
The NSLU2 (Network Storage Link for USB 2.0 Disk Drives) is a 133MHz ARM powered device made by Linksys. It makes USB Flash memory and hard disks accessible over a network (NAS).
Running the BarracudaDrive application server on the NSLU2 and using an external USB flash memory for storing the database files, yields an application server that is virtually maintenance free. Technically, the server should run maintenance free 24/7 for a good 20 years.