Highly regard professional grade personal task management utility. If you’re sincere about managing tasks and projects, and you’re disciplined, OmniFocus is a top choice. Good for pros and small business.

OmniFocus works great as a ‘Getting Things Done’ trusted system but can also be used to fit other task management styles. You can add or hide features such as start and due dates, time estimates and task recurrence based on how you manage your tasks.

9WR - OmniFocus: Personal task, project management system; GTD; integrates iCal, Mail.