How to auto redial busy line with Android?

As with the iPhone, automatic redial is not really directly supported. You have to use secondary apps to do this. Update: Just noticed that the Samsung Galaxy S5 does have auto redial feature. Is it now part of Android or just a Samsung thing?

Perhaps in the Android platform there is more choice, at least last time I looked for an iPhone app. Search for an Android app turns up interesting possibilities. One blog post was really helpful in this.