"Family road trip." Those words can strike fear into the hearts of almost any parent...the endless rounds of "are we THERE YET??", the sudden demand to pee 5 miles after the last rest stop and 50 miles until the next one, and the constant sibling fight refereeing will test the most saintly parent's patience.

Of course, it is also a ton of fun discovering new places or visiting old favorite haunts with your family. To make your road trip less stressful and more fun, here are five apps that will help you find gas at a decent price, fuel up your kids for free, find kid-friendly parks anywhere you go, navigate our national parks (or just dream of doing so) and find out how far away the nearest rest stop is.

Image via Steve Wilson/Flickr