Nextool is a task manager that's based on the "Getting Things Done" methodology, but which adds new features that aren't possible with traditional pen-and-paper GTD. It will automatically pick out "next tasks", and collect them in a special list so they're easy to find. Nextool has support for project management with nested tasks and inter-task dependencies. When using this feature, the application will automatically pick out stalled tasks that require manual intervention, thereby partially automating the review phase of traditional GTD and removing the need for a "someday/maybe" list.