Yes, i totally agree women safety is a major concern now a days and applications like; Vith U, Fightback, Scream Alarm, iFollow- Ladies safety, SOS are just few of the initiative for our women safety. These all apps are very good and great features.
I would like to add another very good app for women safety in this list it is Citizen Cop. One may download it from google play store. Along with women safety it covers corruption, municipal issues and crime in your city.