Paste is a new way to copy and paste for your Mac. It keeps everything you've ever copied and lets you use your clipboard history anytime you need it across all your devices.
UPD: Please check out Paste 2!
Copia is a smart clipboard manager for Mac
Jumpcut is a powerful clipboard managemen tool for all of your copy paste needs.
Clipboard History lets you to manage easier your Clipboard daily. Each data you copy in the clipboard of your smartphone or tablet is saved by Clipboard History. Then, you have just to open Clipboard History and search for the data you want to retrieve.