softwareupdate: Use to view the list of available updates and install updates that you specify.
installer: Use to install certain packages and/or metapackages.
pbcopy and pbpaste: Enable you to create data in one environment and use it in the other.
atlookup: Use to view AppleTalk devices on your local network.
plutil: Permits the conversion of binary files to XML style for editing.
GetFileInfo and SetFile: Enable you to manipulate HFS files with resource forks, and get and set file attributes (such as type and creator) associated with HFS files. Both are located in the Tools folder inside the Developer folder.