GrayFocus

Information:

• Designed for 10.9+
• MacForge plugin to grayscale background windows on MacOS
• Author: w0lfschild

Installation:

1. Download and open MacForge
2. Install GrayFocus

License:

Pretty much the BSD license, just don't repackage it and call it your own please!
Also if you do make some changes, feel free to make a pull request and help make things more awesome!