Version 1.91 of aTicket is now available for download. This includes a number of fixes. It should be possible to upgrade by expanding the new archive in the location used for the existing system, and then deleting the /install directory. The distribution does not include files that are altered during configuration.
aTicket is published under the GNU/GPL v.2 licence. This provides wide opportunities for reuse and permits the project to incorporate code from other GPL projects.
The code for aTicket is stored in a Subversion repository. In Windows, the repository is best accessed using the excellent Tortoise tool. For Linux users there are various good choices.