A couple days ago I found an app (bot) for web browser game named Grepolis (http://grepolis.com). App requests resources automatically every 5 minutes from your conquered villages, what is the best way to getting resources . The best part is that the app is completly free (it's something new for me), but you have to click the ad from time to time to activate your account. It's great idea for me, because it better click on an ad than pay for it every month . App is new but I think that will be developed. I'm using this app and for me it work great.
Link on google play: