Systracker is based on OSMTracker for Android™ (official source code repository : https://github.com/labexp/osmtracker-android). If you are interested in contributing to the original project, please visit https://github.com/labexp/osmtracker-android/blob/master/CONTRIBUTING.md to know the way you could do it.

In order to download the SYSTRA layout, please visit https://github.com/dgarceries/osmtracker-layouts

To help translate OSMTracker, please visit https://www.transifex.com/projects/p/osmtracker-android/