With Masterlist you can have multiple Projects / Checklists. In every Project / Checklist you can have multiple tasks. And under every task you can have multiple sub-tasks. You can organize your tasks with this three level hierarchy.

Task manager combined with Focus Timer (Pomodoro Timer), and performance graphs
With Masterlist you can have multiple Projects / Checklists. In every Project / Checklist you can have multiple tasks. And under every task you can have multiple sub-tasks. You can organize your tasks with this three level hierarchy.