Xtrol

Xtrol is a Konfabulator widget that allows control of a single X-10 enabled device by talking to Indigo home automation software.

See the About window of the widget for additional notes. You need to enter the Indigo device name you wish to control in this widget's preference panel. Control of multiple devices via a single interface, among other features, will come in the Complete Xtrol widget.
What's new in this version:
Initial preview release works but has two rough edges. The widget must be run on the same computer as Indigo, and you must type the device name in to the preferences. Final release will support remote machine interaction, and will pre-populate a list of devices Indigo knows about.