It’s also compatible with the Magic Mouse, as long as you don’t mind tapping instead of clicking. MiddleClick is a free, open-source app that adds middle-click support to the Magic Trackpad and MacBook trackpad. One of them-Magic Utilities-also allows you to middle-click with Apple’s pointing devices on Windows.
We found several utilities that offer middle-click support for the Magic Trackpad, Magic Mouse, and the MacBook’s built-in trackpad.