A free app for Android, by TracesOfWar.
The TracesOfWar app is a project of STIWOT, an international organisation that aims to bring the information about the history of World War Two to the public. The project has a large number of volunteers who are willing to share their knowledge and experience with the public.
What can you do with TracesOfWar?
Use the search function to browse the different kinds of information you can find.
Browse the different categories, such as military, political, and social history.
You can also use the map function for better navigation.
