Apps (Andriod & iOS)

Out of curiosity, what have you been using for a race application where you can do the basics such as pinging start line to get prestart numbers, and top mark to get time/distance to laylines?

I'm not looking for a "repeater" which would display and interact with, say, Expedition, but really more fore a complete standalone app which may or may not be recieving NMEA data for wind.