Psygraph
Code for the Psygraph mobile application
...It includes a stopwatch, timer, counter, and note taker (voice recorder), each of which collects data from the device’s sensors (e.g. the device velocity and location (via GPS)). Although the interface is simple (a button or two on each screen), the data is saved for later analysis and display (you can store and view the data on WordPress). It is a scientific instrument that is easy to use. It makes an excellent general-purpose stopwatch and timer, but you can also categorize the data that you collect, so that time, location, and velocity data is associated with that category (or activity). ...