CopyClip - Clipboard History Manager is a free Mac program, being part of the category Utilities.
Flycut (Clipboard manager) is a free Mac program, belonging to the category Development.
If you’re copying a text, you don’t want to paste it as is into another application. Instead, you want to make sure that the entire piece of text is there...
iClip is a handy, trial version program only available for Mac, being part of the category Utilities with subcategory Clipboard.