Torque Pro is a good one, just keep in mind it's an app not a professional scanner.
Vin Viper - I use this at work. Scan the vin, snap a picture of the license plate and vehicle, upload it to the office computer then onto the invoice.
Transtar & Slauson for ****** parts
Napa & World Pac for auto parts
There's a whole slew of tool apps, levels, lights, protractors, electrical calculators & diagrams, resistor i.d., etc.
Garage Buddy is eh,so so. I would like to see more "garage" related apps but there's just not much available yet.