Eifel, developed by Arne Houben, is a free Android app that aims to be your personal guide to the Eifel region in Germany. The app provides a wealth of information about the region, including its famous crater lakes, basalt quarries, and limestone formations, as well as its picturesque towns and villages.

The app is an excellent resource for hikers, with well-marked trails and detailed descriptions of each hike. It also offers information about local cultural events and festivals, making it a great tool for planning your trip.

Overall, Eifel is an impressive app that is easy to use and provides a wealth of information about one of Germany's most beautiful regions. Whether you're a hiker or a culture enthusiast, this app is a must-have for anyone planning a trip to the Eifel region.