Recent Microsoft Word versions (at least since Word 2002, and probably earlier) have a button on the Edit menu where you can show the clipboard. This opens a window, usually to the right side of the window that shows what the contents of the clipboard are. The window can also be opened by keying Ctl-C twice, with the first Ctl-C copying what's selected and the second one opening the window.

Strictly speaking, in the versions with this feature, a new "Copy" doesn't replace objects already in the clipboard, but if you use the simple-minded Copy and Paste commands/keystrokes it's a LIFO like the "Spike" of earlier versions. If you open the clipboard menu, you can choose an "older" copied object for insertion in the program where the clipboard window is displayed. An older object is "pushed out" only if the last addition filled the clipboard memory space. The default appears to be to remember the last 24 objects saved, but I haven't encountered a size limit for total clipboard space.

No extra program(s) required, although the add-on programs might provide some additional options.

I haven't looked to see whether this option is available in all Office programs, but would expect it in the useful ones. It's not directly available in IE, but if you keep Word open, what you copy in IE appears in the clipboard in the Word window, so you can - with a little extra effort - track what's there.

John