Visit a City - Create your personal travel guide
TripIt - TripIt is a travel app that creates a master itinerary to organize all of your plans for your vacation or work trip in one spot.
GetYourGuide - Get tickets to the most popular attractions while travelling
Sygic Travel Maps - Itinerary planner for independent travelers
Travelchime - Google Docs for planning your trips with friends.
Away Away - Travel guides from modern-day explorers