TinkerDroid makes it possible to control conventional spark plugs, switches and -jalousieschalter (actuators) over TinkerForge remote switch Bricklets. In addition, the Dual Relay Bricklet solution they have (respectively 240VAC / 10A or 30VDC / 7A) has two relays. For more information on the TinkerForge homepage. In the documentation for the remote switch Bricklet there is also a list of supported wireless actuators.
Note: The app serves its purpose only if you have the appropriate TinkerForge hardware. Without it, it can be installed much sense.