There really is no other app out on Android as robust as Chainfire's DSLR Controller when it comes to... controlling your DSLR camera. The $8 app - which already had over 10,000 downloads and a boatload of control features - just got a whole lot better this morning with a major update that should have the app's fans absolutely ecstatic. The mile-long changelog includes tons of fixes and improvements, but the new feature list is impressive on its own.
Canon's 6D camera and the WFT dongle are both now supported via Wi-Fi connection to your Android device (!), meaning you can cut the cable to control those particular pieces of hardware, which is sort of amazing.