Kanban Board Software
I have used todo lists for quite a while, and I find it relaxing to be able to write tasks down. This way I don't have to keep all the tasks in my mind and try not to forget anything. The software that I have used was list-based. For short lists or short-term projects this was nice. One could just add a few tasks, and complete them later. One could just pick the next task from the list, and eventually it was all done.