ExternalDisplayBrightness 1.3.0 for Mac is available as a free download on our application library. Our antivirus scan shows that this Mac download is safe. The most recent installation package that can be downloaded is 4.8 MB in size. The software belongs to System Tools. This free Mac application is a product of František Nesveda.
From the developer:
ExternalDisplayBrightness is a small utility which allows you to change the brightness of external displays connected to your Mac using keyboard shortcuts, just as you would change the brightness of the built-in display on a Macbook. By default the application takes over the default brightness keys on a Mac keyboard, which are mapped to F14 and F15, respectively.
You may want to check out more software for Mac, such as Macfilink, Missing Sync for Palm Pre or FourEyes3D, which might be related to ExternalDisplayBrightness.