If you're planning a trip to Moscow and will be using the metro system, then the Moscow Subway Stations Plans app by Involta app is a must-have. This free app is available on Android and falls under the Travel & Navigation category with a subcategory of Maps & GPS.

The app allows you to plan your route in and out of crowded stations beforehand, without having to stop in the flow of people or learn signs on walls. With the introduction of the Moscow Central Circle (MCC), the need for maps of transfers has increased, and this app provides the necessary information.

You can use the app to make appointments with people at specified exits by sharing the map of the station using instant messenger apps. Additionally, you can go out of the subway at the exit nearest to your destination using the map of the station. However, note that the app only has partial English language support, so some knowledge of the Russian language is required.