mouse34Btn

Use your 3-th and 4-th mouse buttons to Copy (Cmd+C) and Paste (Cmd+V).

mouse34Btn lets you use your 3-th and 4-th mouse buttons to Copy (Cmd+C) and Paste (Cmd+V) in all Mac applications that support these commands.

It’s very lightweight and is meant to replace Logitech Control Center LCC or BetterTouchTool which otherwise are good apps, but are too heavy.