You'll have access to all the data from your Garmin Connect at your fingertips (literally!). Not to mention when used in conjunction with compatible Garmin devices, you can share your activities in real time as they happen—limited to friends you've sent an invitation—and wirelessly upload that very activity to the Garmin Connect website. Free; iOS, Android; Connect.Garmin.com
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With so many available running apps (and many for free—read zero dollars), it can make it hard settling on just one. You can of course always try out a few and see which you like best. But if you'd rather be, y'know, running, than embroiled in yet another sign-up process, we've got a list of top running apps that should hopefully take some of the guess work out of your decision.