Organize supports you with the GTD method in several ways
- Inbox: Quickly create new tasks and get them of your mind. You can sort the tasks later when you have enough time for it.
- Context: Assign one or more contexts to each task
- Regular review: Use the "Review Next Steps" view to get an overview of upcoming tasks and reminders. You can set individual Start Dates, Due Dates and additional Review Dates for each tasks - including repeating review dates - so you get i.e. weekly reminders of tasks that are not time critical until you find enough free time to complete them.
GTD itself is not based on any tools, but the author recommends you to start with real-life folders instead. However you can easily rebuild this folder based system with Collections using Organize.