Third-party freeware which automates installation of SharePoint 2010/2013 using PowerShell-based installation script.
This project consists of PowerShell scripts, an XML input file, and a standard windows batch file (to kick off the process) which together provide a quick and near-unattended installation and initial configuration (Service Apps, My Sites) of Microsoft SharePoint Server 2010/2013. Works on Windows 2008 (though I hardly test on that OS these days), 2008 R2 and Windows 2012 (x64 only of course).
Questions having the autospinstaller regards the use of the CodePlex project AutoSPInstaller.