Llama Life - Say goodbye to never-ending lists, and hello to daily bliss
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Microsoft To-Do - Task management tool
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
TaskPaper - Plain text to-do lists for Mac
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.