The first is https://workflowy.com/
It’s nothing more than an enormous hierarchy where you can easily add/edit/sort/search – I have found this to be THE best tool while trying to brainstorm. It let’s you very easily and quickly organize your thoughts.
The second is http://www.trello.com
This is basically like a white-board or a Post-It note board in a war-room or project room. You create tasks, assign them to people, track status – move items, etc. From this main interface, you can can easily manage a small to medium-sized project pretty effectively!