Download this app if:
Remote Release allows you to "remote release" your Canon EOS DSLR from your Android device with only a USB cable.
Wi-Fi support is also present, if your camera supports Wi-Fi or you are using a go-between like the MR3040 - see further details on the DSLR Controller website (...
Snap snap — Pretty cool, if you have the right kind of camera... This is a free version of the remote DSLR camera controller app released a few months back.