Wikipedia
Maps.me
Maps.me (formerly named MapsWithMe) is a mobile app for Android, iOS and BlackBerry that provides offline maps using OpenStreetMap data. In November 2014 it was acquired by Mail.Ru Group and became part of its My.com brand. In September 2015 the app was open sourced. First, the whole team has developed an application in Switzerland and Belarus. Leader of Maps.me is Yury Melnichek.