PWM let you organize your project in a Web 2.0 way.
Project Web Manager is a free open source project for organizing your projects. You can create units/projects/task and monitor them through a Web 2.0 interface.
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.
Project Manager and Bug Tracker for Agile Software Development. Flexible Task Workflows and Views. Supports Velocity and Iterations planning. Web-based, Easy to install and user friendly. Supports unicode. Free unlimited online hosting on Amazon cloud.
SB Task manager is a lightweight web-based Task Manager for small businesses, designed for managing large numbers of diverse tasks and producing reports for meetings. It is written in ASP and runs on IIS, with MS SQL for a database.
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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.