Travel Guide for Hamburg (Germany)
-download additional books (small fee)
-regular/free map & content updates
-detailed street maps (OSM)
-turn by turn routing
-point of interests + Wikipedia
-location aware search (GPS)
-supports 20+ languages
-no expensive roaming costs

DDM (Don't Disturb Me) is an application which allows you to turn of the ringer of your Android phone for particular incoming numbers and (if you want) in particular days and/or times.