Track, measure, and improve your fitness.
RunKeeper uses your phone's GPS to track your fitness activities. Get your distance, time, pace/speed, how many calories you burn, and your path traveled on a map. All to track, measure, and improve your fitness.
Little Hiccups — Occasionally, this app is a little inaccurate, but for the most part, it's a really awesome totally free way to keep tabs on yourself as a runner.