We’ll show you How to install TicketsCAD on CentOS. Tickets CAD is a free open-source computer-aided dispatch (CAD) software and it is a part of the open ISES (Open Information Systems for Emergency Services) Project. Tickets CAD is primarily designed to support community emergency services. This install guide assumes that Apache, MySQL and PHP are already installed and configured on your Linux VPS. At the time of writing this tutorial, the latest version of TicketsCAD is 3.09 and it requires: