This folder contains two folders which contain multiple ROS packages.

calibration - Contains the Calibration package with a GUI, a multisensor fusion package and their ROS package dependencies.
calibration-old - Contains the Calibration package without a GUI and its ROS package dependencies. It's a modified version of the calibration package developed by Marcelo Pereira (http://lars.mec.ua.pt/public/LAR%20Projects/Perception/2015_MarceloPereira/).

The main extrinsic calibration package is "calibration", available @ https://github.com/davidtvs/calibration
"calibration-old" is DEPRECATED but is available @ https://github.com/davidtvs/calibration-old

The "calibration" package contained here might be an older version, it is recommended to clone the package from the GitHub link above:
git clone https://github.com/davidtvs/calibration.git -- recursive

Appendix A from "Tese_David_Silva_65033.pdf" contains instructions on how to install and use the extrinsic calibration package "calibration".