The Free Russian Folk Song Collection is an offline reference book that provides a collection of Russian folk songs with their lyrics. It is developed by AP Develop and is available on the Android platform. The application is free to download and use.

The application has a large database of songs that can be downloaded with a Wi-Fi connection. Once downloaded, the application can be used without an internet connection. The application has several features, including the history of viewed songs, the ability to add songs to favorites, and the ability to manage history and favorite lists.

Users can customize the app with various settings, including changing the font and theme. The app also includes a widget that displays a random song of the day. It is important to note that this application contains advertisements.

Overall, the Free Russian Folk Song Collection is a great application for anyone interested in Russian folk music. The app's offline capabilities and features make it easy to use and navigate.