ProduKey (64-bit version)
The program is exceedingly simple to use. Run it, and it displays all of your product keys and product IDs for Windows, Microsoft Office applications, Windows Server, and Microsoft SQL Server. There are a variety of command line options, if you'd like to do things such as get product key information from a remote PC, or save the information to a text file.
Note: This software comes in 32-bit and 64-bit versions. This is the 64-bit version, which is for 64-bit PCs running a 64-bit OS. If your PC is running a different supported OS, please download the 32-bit version instead.
-- Preston Gralla