Bike Bell

This app overlays a small bell button on top of other apps.

Great for using your phone mounted on your bike as your bell while also using other bike tracking apps.

It also allows custom bike bell sounds, two different bells and a clock/timer option

If you want to go further, the app includes a GPS / speedometer widget that allows you to monitor and record your ride. If you choose to, you can create and save a GPX file to synchronise with your other favourite cycling apps