openni_launch package is moved to https://github.com/ros-drivers/openni_camera/ as of openni_camera#57. This repo will remain as it is for backward compatibility.
The openni_launch package contains launch files for using OpenNI-compliant devices such as the Microsoft Kinect in ROS. It creates a nodelet graph to transform raw data from the device driver into point clouds, disparity images, and other products suitable for processing and visualization.
See also: rgbd_launch.