xdata implements an interface to arbitrary key-value pairs which are accessible to simple shell and Perl programs. Applications for this include to-do lists, contact databases, browser bookmarks, and anything else which requires small pieces of data to be referenced by keys. xdata stores timestamps for the data it manages, and comes with a program to synchronise databases among cooperating hosts. This allows you to propagate information among hosts in a transparent fashion (creations, updates, and deletes are correctly handled). xdata consists of a set of shell-level utilities and a Perl module.
xdelimitarea is an X Windows program that provides a non-intrusive way of finding out the location (with respect to the root window) and dimensions of an arbitrary rectangular area on a computer screen. This tool might be helpful for GUI or Web designers who are concerned with layout issues.
The Exquisite `df' (xdf) is a souped-up version of df(1) rewritten from scratch and focused on flexibility of field selection and output format. It offers HTML and CSV outputs, besides the traditional text-based console output. It is fit for system administrators who are tired of post-processing df(1) output through shell or Perl scripts in order to avoid broken lines or to get a simple total/summary line.
Xdx is a client to connect to a DX-cluster for amateur radio. DX messages will be displayed in a list, and announcements will go to a text display. In addition to the usual functions, if you have hamlib installed it can control the radio and set the frequency simply by double clicking a DX-spot (using rigctl).