Estimated Users: 5 million+

I hate traffic. Better yet, I loathe traffic. There are few things worse than being stuck in traffic.

"I'm in my car. The engine is running and I have someplace to be but I'm getting nowhere fast because apparently everyone else on the planet had the same idea." That's the way it feels sometimes doesn't it?

Enter Waze, an app that uses the GPS functionality in your smartphone and user gererated content from other drivers to create smart maps. See an accident? Report it to Waze and everyone knows to avoid it. Cruising along on the highway only to see your smooth sailing commute turn into a parking lot? Waze uses your phone and those of your fellow angry commuters to alert the people that there is traffic ahead.

It's pretty cool. The only major flaw that I see is one that is there for safety sake. You can't update app while your phone (meaning your car) is in motion. What if I'm a passenger? Anyway, if you commute you should definitely check it out.