USD $8 for DSLR Controllerhttps://play.google.com/store/apps/details?id=eu.chainfire.dslrcontroller
Just get and install this, it's the Bee's Knees for tether controlling your Canon.
I use it with both my Galaxy S4 and my 10" ASUS tablet.
10X live view zoom for focusing is marvelous, it'll do focus stacking, intervalometer, HDR bracketing, shutter count and lots lots more.
Didn't care much for it over WiFi to my 6D on the Galaxy, basically useless.
Laggy but useful on the ASUS over WiFi.
Tethered via a USB Host (also known as USB OTG, On The Go) it's rather responsive, you'll likely find many other uses for a USB Host adapter cable.
Support is sketchy, no matter, the app is basically self explanatory, connect it up and poke around.
On the standard 1-10 scale I rate it about a trigazillion, just get it.
Since tethering with DSLR controller, I can't stand to even think about Canon's free EOS Remote android app nor DPP on Windows nor tethering via Lightroom on Windows.
Seriously, get this. But get a USB host adapter first.
From what I gather, Helicon Focus has similar capabilities as DSLR controller, but they tease you with free, then want USD $40, $48 or $75 for an unlimited license. Haven't tried it, doubt I will since DSLR Controller is so awesome.
USD $5 for The Photographer's Ephemerishttps://play.google.com/store/apps/details?id=com.crookneckconsulting.tpeandroid
Sunrise, sunset, moon rise, moon set times and angles for anywhere, anytime. Plan your landscape excursions with this, then check the weather report.
Interface on a phone I'd call tight due to screen size, still, it's workable and very informative
If your phone has IR, DSLR Remote
is a nice little substitute for the small, push button IR remote controllers available for most camera brands.
It's not bad, I've no complaints, a very simple app, efficient at its rather simple task.
Photo Mate R2 is a USD $9.49 purchase, it's a RAW converter for Android.
It's on my wish list, but I don't really have any interest working on RAWs on Android when I've got a rather powerful Windows 7 PC I built expressly with Lightroom in mind.
No experience with it though it does sound intriguing.
Claims to be able to "Calibrate your tablet display within the app
" which sounds plenty trick, then I look at my PC and realize I'm just not going there on my tablet.
Canon's own EOS Remote is free, um, you get what you pay for. I'm not even going to bother about a link for it. It should be or maybe could be what DSLR Controller is but it's not even close.