To install, download the project from Github, open and build ProjectWindowName.xcodeproj. The plugin is built directly into your user's Xcode plugin directory ~/Library/Application Support/Developer/Shared/Xcode/Plug-ins. Quit and relaunch Xcode to use.
Alternately, you can install using Alcatraz.
ProjectWindowName has been tested with Xcode (5.1.1, 6.0, 6.1) on OS X 10.9.x.
ProjectWindowName has no user interface, it changes the Project / Workspace window title to include the Project name. e.g. "[Project name] - [File name]".