JSTx is used for displaying overlay graphics and text on top of a Philips television, changing channels, receiving remote control keys and changing television display modes. It is a command line utility to execute jointSPACE commands on a device that supports the jointSPACE protocol for Philips televisions (see http://jointspace.sourceforge.net for details on jointSPACE, which is based on DirectFB).
It is used in various home automation/internet-of-things projects.
There are three versions...