Today, if you're in need of a task manager application, you're looking at a category filled -- perhaps even overfilled -- with options. If you carry a smartphone, you probably have a to-do list app in your pocket already. Gone are the days when Linux users had to panic over finding a suitable clone for Microsoft Outlook like Evolution. Web-based services like Google provide calendars and to-do lists that sync with multiple computers and smartphones. That said, I prefer a desktop to-do app that is easily transported to my multiple computers.