Ditto is an extension to the standard windows clipboard.

Jumpcut is an application that provides "clipboard buffering", that is, access to text that you've cut or copied, even if you've subsequently cut or copied so…

Clipjump is a multiple clipboard management utility for Windows.

ArsClip is a freeware clipboard manager utility. ArsClip monitors the clipboard and keeps track of the entries.

Ethervane Echo is a clipboard extender.

ClipMate is a clipboard Manager For Windows.