Surreal ToDo is an AJAX enabled web 2.0 list manager written in php with jquery and mysql. Lists are organized in tabs that allow multiple pages per tab. Everything is drag and drop for organization.
ackerTodo is a web-based todo list manager which supports multiple users, recurring tasks, multiple languages, categories and much more! It's written in PHP/MySQL.
AnotherTodoList is a little web 2.0 todo list and / or post-it application.
Its goal is to be very user-friendly and easy to use (including drag and drop for items, simple edition by double click, etc).
php todolist is a more advanced approach for simple todo lists. It is an ajax/sql-based multi user todolist, with priority, status and categories. You can use it as a bug track / feature request and task manager system within a group of developers.
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As the project name already describes this will be just another todo list which offers a centralized storage of the todo items, which can finally be processed decentralized either via a client application or via a web interface.