A free program for Android, by CityMaps2Go.

This is a travel guide app with an offline map of Lisbon, where you can search for locations, access useful information, and get useful tips for your upcoming travels.

This is a very useful app to download if you want to visit Lisbon. You can search and find many places to visit, such as museums, shops, and tourist attractions. 

This app works very well, even in offline mode. It also works without data roaming, so you can use it anywhere in the world, as long as you have an internet connection. This app is very useful to visit Lisbon, but you can also use it for other purposes, such as finding the best places to visit.