Company YR Creative Design created these great apps:
Hong Kong Offline Map (Metro Subway and offline GPS), Paris Offline Map (Metro Subway and offline GPS), London Offline Map (Metro Map, Offline, GPS support), Paris Offline Map Pro (Metro, GPS), Chiang Mai Offline Map (Offline GPS Support), Los Angeles Offline Map (Metro Map, Offline GPS Support), San Francisco Offline Map (Metro Map, Offline GPS Support), Barcelona Offline Map (Metro Map, Offline GPS Support), Hong Kong Offline Map Pro (Metro, GPS), Barcelona Offline Map Pro (Metro, GPS), and others..