This project consists of two components: AutoRaise and Launcher.
The AutoRaise binary is written and maintained by Stefan Post at https://github.com/sbmpost/AutoRaise. From the readme:
When you hover a window it will be raised to the front (with a delay of your choosing) and gets the focus. There is also an option to warp the mouse to the center of the activated window when using the cmd-tab key combination.
See also: https://stackoverflow.com/questions/98310/focus-follows-mouse-plus-auto-raise-on-mac-os-x
While AutoRaise is concerned with GUI window and mouse behaviour, as a command line application it lacks a GUI itself.
Here's where the Launcher app bundle comes into play: a menubar application that allows to control and configure the AutoRaise binary. A mouse click on it's menubar icon will start/stop AutoRaise, preferences can be configured from it's context menu and will be saved between sessions.
Please note that this project does not alter the upstream AutoRaise code, it merely wraps an app bundle around it for convenience.
There is no installer or pre-built binary being distributed via Github but AutoRaise & Launcher binaries can be installed via MacPorts:
sudo port install AutoRaise
This installs the menubar app bundle (which includes a copy of the upstream AutoRaise cli binary) into your Applications folder and symlinks the cli into the Path, usually into /opt/local/bin
Simply clone, open and build this project in XCode.
Like upstream XCode will first build the AutoRaise binary by running
g++ -O2 -Wall -fobjc-arc -D"NS_FORMAT_ARGUMENT(A)=" -DSKYLIGHT_AVAILABLE=1 -DEXPERIMENTAL_FOCUS_FIRST -DALTERNATIVE_TASK_SWITCHER -DOLD_ACTIVATION_METHOD -o AutoRaise AutoRaise.mm -framework AppKit -F /System/Library/PrivateFrameworks -framework SkyLight
and include it when finally building the Launcher app bundle (AutoRaise.app).
To install copy AutoRaise.app into the /Applications folder and/or the AutoRaise binary to e.g. /usr/local/bin
Open AutoRaise.app and click on the menubar icon to enable/disable AutoRaise with default settings. Preferences are saved between sessions in the default ~/Library/Preferences folder.
On first launch you should be prompted to grant access for AutoRaise in System Preferences > Security & Privacy > Privacy > Accessibility.
More options to run and configure AutoRaise are explained in the upstream project's Readme.