Along with the release of Windows Server 2012 R2 Preview, Microsoft also released System Center 2012 R2 and SQL Server 2014 Preview.
For you who haven’t found out the news, Microsoft System Center is an integrated platform which make you easier in arranging datacenter, cloud, and client-server. While SQL Server is a Microsoft-made artificial management database software.
Both can be downloaded and used for three months free. If you have interest to try, you can download it from this link.