Running App Suggestions

I just got back into running and have been running for the past two months. I would like to start training more seriously with an actual plan. I have checked out a few running apps and the only one I like so far is the Runna app. I was wondering if there are any apps like this that would give me a free running plan that is customized to me. It is important for it to be free because I do not have the money right now to pay for an app.