Chinon is configurable unit frames add-on. It displays one or several buttons for each player and pet in your party/raid, sorted by class or group. Clicking on these buttons cast a configurable spell or run a macro.
Let's call them buttons, then. It creates buttons for each member in your raid, you click on it, it casts the spell that you want. It does not alter the unit frame, it's something like Grid. Anyway, although the "buttons" can be pressed directly without using Clique, it is still usable with mouseover macros.
Yes, there was a bug at some point with Curse, screenshots weren't showing and the addon couldn't be downloaded.