Tapatalk -- an app to view tnttt, and it's great!!
Google Earth -- sometimes you can see your campsite/campground before you go
Navigon -- a navigational app that has literally taken me all over our wonderful country. I still carry maps and an atlas, but Navigon suits me just fine.
Gas Buddy -- check local gas prices using your GPS location
The Weather Channel -- the free one is all I've used. GREAT!!! On one trip, I was coming up on a severe storm. We stopped for the evening because TWC showed we were going straight into the midst of the storm. A tornado did skip across the Interstate, doing damage on both sides of the road. Thank you, TWC!! Oh, and that storm was the reason I downloaded TWC.
Camping & Outdoor Recipes -- I'm not a crreative cook and this has given me ideas to cut the boredom of my cooking.
Have2P -- it wasn't working for a few months, but it is once again working.
AAA Discounts, AAA Trip Tik, AAA Roadside -- it's there if you need it.
AllStays Camp & RV -- Campgrounds and RV parks in your vicinity. It even shows the Walmart "Ask to Park" down the street.
Mobile KOA -- I stayed in KOA Kabins last spring when I found the weather was too cold for me to tent camp. It also shows the KOA Kampgrounds close to you, in a specific state, or in a specific province (Canada)
Leafsnap -- take a pic of a tree's leaf and you'll get an answer as to what kind of tree it is.
Flashlight -- comes in handy if you just can't find your flashlight.
YPmobile -- Yellow Pages mobile. Using your GPS location, it can give your nearby businesses, gas prices, deals, or any specific business you're looking for. It gives the distance to the business, and even has a mapping app to give you directions to get there.
Redbox -- gives the location of the Redboxes near you.
Craiglist -- bored? See what's for sale around your location
There are many apps for specific department stores (Walmart, Kohl's, etc.) that are free to download. Some even show the nearest one to you using your GPS. Stores such as Michael's have coupons on their iPhone app that can be scanned at the cash register.
There are many apps for specifc restaurants or pizza places. You can order food on-line, find their locations, etc.
I use some apps specific to my home location/state. IN Wineries -- locations of the wineries in Indiana--sounds like a good app so I can go wine tasting on my camping trips!!!
There's even an app "Indy DT" -- Indianapolis Downtown What to do? It shows all of the museums, eateries, shopping, parks, sports, worship, and arts/entertainment venues in the downtown area. Look for apps for the cities around your campground.