bit-tech.net has a 5 page listing of open source alternatives to Windows Home Server.
Most Features of WHS can be Easily Duplicated – But would you want too?
It takes a look at OpenMediaVault and VortexBox for Media Streaming. FreeNAS and Openfiler for file sharing. Nagios for host health monitoring and for centralised backup Areca Backup, Amanda Community Edition and Bacula are taken a look at.
Its an informative list (you traitors!) which you can find here.
Open Source alternatives to Windows Home Server is a post from: MS Windows Home Server - Your Personal Guide to Microsoft Windows Home Server!
from MSWHS.com http://www.mswhs.com