Let me preface by saying that I in no way mind paying for apps I use a lot to support developers (I often buy IAPs just to support them.) I'm looking for an app similar to Name Mangler to batch rename image files (I hate the IMG_2439) thing. The thing is, this isn't an app I would use often (maybe once or twice a year). I hate to spend $18.99 on a scarcely used utility. Are there any cheap or free alternatives?