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.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Roadtrippers - The ultimate road trip planner to help you discover extraordinary places, book hotels, and share itineraries all from the map.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
WorldMate - WorldMate is a travel app that helps individuals plan and organize trips. The app is available for Android and iOS mobile devices, and it is free to download and use.
Org mode - Org: an Emacs Mode for Notes, Planning, and Authoring