ClipX equivalent for Mac?
I searched Alternativeto.net and came up with these search results:
Jumpcut


Jumpcut is an application that provides &quot;clipboard buffering&quot; — that is, access to text that you've cut or copied, even if you've subsequently cut or copied something else. The goal of Jumpcut's interface is to provide quick, natural, intuitive access to your clipboard's history.

It sits in your menu bar:

And you can assign a hotkey to bring up a pasting window:

According to the Flycut website, Flycut is based on Jumpcut. I am currently using it and love it!
PTHPasteboard
Pretty close to Jumpcut, with the exception that there is a paid upgrade.