http://vmdepot.msopentech.com/List/Index
http://www.hanselman.com/blog/Over400VirtualMachineImagesOfOpenSourceSoftwareStacksInTheVMDepotAzureGallery.aspx
http://www.heitorlessa.com/virtual-machine-images-for-virtualbox-and-vmware/
https://bitnami.com/
http://virtualboximages.com/
SharePoint 2013 Development Environments
http://www.matthewjbailey.com/sharepoint-2013-dev-environment/
SharePoint 2013: Setting-Up A Clean And Recoverable Development Virtual Machine
http://www.codeproject.com/Articles/490811/SharePoint-Setting-Up-A-Clean-And-Recoverable