sleek is a todo.txt manager, free and open-source (FOSS)
Simple Online Planning
Freeplane add-on for task management and memo taking
The Freeplane add-on that syncs a GTD mind map with a todo.txt file
simple php/mysql project management system for sustainability planning
WeekToDo is a Free and Open Source Minimalist Weekly Planner and To Do
a free mind mapping tool, to especially assist decision making
A mini todo and project management application
Open source project management
Free flexible open source todo manager featuring hierarchical tasks
Todo task manager with simple, fast and intuitive user interface
Generate Work Breakdown Structures (WBS) in Excel.
German Template for Bugzilla
A pretty little project Manager
Collabtive is web based project management software. Simple and easy.
PWM let you organize your project in a Web 2.0 way.
Daily Task Management Software with Report Generation
MNoteLite is a simple todo manager
PHP & MySQL/SQLite -based Project Management System