appwiz.cpl for Server Core

appwiz.cpl is the Add/Remove Programs dialog. On Windows Server Core the control panel is not available. Instead the wmic program can be used to gather the install list. The output from the command is pretty long, so it’s best to store it in a file and open it with notepad.

wmic product get > list.txt 
notepad list.txt

(http://technet.microsoft.com/en-us/magazine/dd630943.aspx)

Or, with powershell (if .NET 3.5.1 is installed)

gp HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | Select DisplayName, DisplayVersion, Publisher, InstallDate, HelpLink, UninstallString | ogv

(http://blogs.msdn.com/b/powershell/archive/2009/11/15/i-can-do-that-with-1-line-of-powershell-installed-software.aspx)