Here in this post we list some of such easy to use and free mac based to do list apps.
iGTD is a MAC based task management software that is allows you to divide tasks by context and projects. It is based on the getting things done methodology.
License : Free
OS : Mac OS X 10.4 PPC, Mac OS X 10.4 Intel, Mac OS X 10.5 PPC, Mac OS X 10.5 Intel
iGTD has now been discontinued. Older versions are available for download.
Simple Task is an easy and simple task list manager. It allows you to drag the tasks according to priorities. Moreover, it allows easy filtering of tasks using colors based on whether complete or pending.
Simple Task can be used as a menubar application, as a regular application or as both at once.
OS: Mac OS X 10.5.6 or later
Anxiety is a free application for Mac OS X Leopard. Anxiety is able to synchronize with iCal and Mail. It is a light weight to do manager as its tagline says. Its simple but supports a number of features.
OS: Mac OS X Leopard 10.5+
lis.to is an open-source desktop client that supports Mac. It's fast and light weight, allows unlimited tasks, quick data entry and is safe and open. It also supports syncing service but it comes with an yearly subscription.
OS: Mac OS X 10.5.1 or later
TaskPaper is a simple solution to your to do lists if you don't want to be involved in other complex task management and to do list management softwares. You just need to type your lists into TaskPaper and each line is formatted into a project, task, or note.
Price: Free (Paid edition also available)
OS: Mac OS X 10.5+
Spark is a powerful and simple task management software for the Mac. It supports project creation and grouping, syncing with icalc and a special due date feature.
OS: Mac OS X and higher