Car sharing is becoming a huge market in cities all around the world, but the service makes sense only with smartphones. So far, in Germany there was no car sharing app available for Windows Phone, but now there is. CarJump is the name of the app and it supports all of the most common vehicle sharing services such as car2go, DriveNow, Multicity and Nextbike.
Besides supporting all these services there are also several filtering options (for example engine) and it works in all German cities with car sharing services available, but best in Cologne, Berlin, Munich, Düsseldorf and Hamburg.
The app itself is free and can be found here, but it unfortunately does not support the Lumia 1520 or any other 1080p device.