DORIS is a free map app developed by Land Oberösterreich for Android devices. With this app, users can access a wide range of maps related to land and forestry, urban planning, environmental protection, traffic, water, arts, culture, childcare, and more. The app also allows users to combine these maps with various background maps, including high-precision orthophotos, city maps, and even historical maps.

Aside from exploring maps, DORIS also offers additional features such as searching for addresses, places, rivers, mountains, etc. in Oberösterreich, measuring distances and areas on maps, and using the app's precise elevation data to measure the height of points. The app's most recent update also includes the digital cadastral map, which allows users to view property boundaries on their mobile devices.

Other useful tools integrated into the app include a compass, news content on the start screen, a bookmark manager for saving map sections, and additional tools for generating climate reports and climate scenario reports. Overall, DORIS is a highly comprehensive map app that offers a wealth of information and tools for exploring Oberösterreich.