X10 is a home automation industry standard, and X10 controller software is the programming that powers X10 controllers. These controllers connect with the X10 infrastructure and modules to provide the system's automation.
X10 systems rely on a power line that connects the components of the system together and various modules that control items within the home. Modules for controlling lighting and locking doors, for example, are common components. X10 controllers send commands to these modules, and users can often customize these controllers in some way. X10 controller software varies by device, but it often contains the software or firmware that powers the controller's basic functionality and software that allows users to program the device.