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This application is fully open source under GPL v3,
An extension to display your Pebble (with >2.0 firmware) current battery level in the excellent DashClock lock screen widget.
When adding the extension, make sure to open the preferences activity to install the companion watchapp.
Alternatively, directly open the link below in your Android browser if you encounter difficulties.
(NB: Pebble is only capable of reporting very coarse-grained battery estimates, in practice battery level may vary unexpectedly)
Source code at: https://github.com/garuma/pebble-battery-dashclock-extension
Watchapp direct link: https://neteril.org/pebble/companion_watchapp.pbw
Bikr will track how many miles you cycle and give you a roundup per day, week, month and how you compare with the previous corresponding metrics.
Best of all, you don't have to do anything. It will take care of itself and detect your rides automatically.
Bikr is an open-source application built on the Xamarin platform. Source code is available at https://github.com/garuma/bikr
Alternatively, it's a testbed for various technique available in Android and put down in C# form.
GitHub project: https://github.com/garuma/FriendTab
Usage guide: https://github.com/garuma/FriendTab#how-to-use