If you are looking for Visual Studio 2013 Tools for Office download in Google and Bing the go luck to you. Microsoft no longer calls it Visual Studio 2013 Tools for Office. I believe it is called Apps for Office but again I cannot find a proper place to download Apps for Office. I only managed to find this blog http://blogs.msdn.com/b/officeapps/archive/2013/03/05/download-the-office-and-sharepoint-visual-studio-tools.aspx and download through http://aka.ms/OfficeDevToolsForVS2012 anyhow the Office 2013 template appeared in VS 2012.
You will see the screen below if you install the App for Office successfully.
You will see Office 2013 appears in your VS 2012.