There are many To Do list softwares out there but in my list top 5 are:-
TaskFreak: - Taskfreak is required to be installed on your own server with PHP and MySQL. It features status marking, priority control and excellent organization. Online demo available at site: www.taskfreak.com.
Ta-Da Lists: – Ta-Da list is a 37signals product. It is very simple and easy to use. You can create multiple lists and you can share them with friends using a public address. You can read more about Ta-Da Lists from www.tadalist.com.
Wallnote: – Wallnote allows you to access your to do list online at wallnote website (http://www.wallnote.com) as well as from your Windows Desktop. Wallnote has basic to do list features where you can add and edit tasks.
Remember the Milk: – It allows you to organize your tasks into tabs and tags, make time specific tasks with repeat interval and automatic reminder, and even have collaboration features. Please visit www.rememberthemilk.com to get to know more about this handy tool.
Voo2do: - Voo2do is an advanced task and priority management for busy and ambitious individuals. It allows you to organize by project, deadlines and time tracking, collaborative functionality, and more. Read more about Voo2do from www.voo2do.com