apps

Shazam for the same reasons as frederick_76's post.

But for automotive related things, "Car Performance Timer", it uses the phones GPS to operate, has a Speedometer function to check the vehicles accuracy, and a Performance Timer that will give you 0-60, 0-100 times, 60 foot, 330 foot, 1/8 mile, 1000 foot, and 1/4 mile times. The app is free with basic features or $4.00 for the full version which allows you to store runs as well as other functions.