Open source note taking and to-do app with synchronization
Simple Online Planning
The Freeplane add-on that syncs a GTD mind map with a todo.txt file
a free mind mapping tool, to especially assist decision making
Freeplane add-on for task management and memo taking
Easy-to-use personal time tracking application for Windows and Unix
Create sticky notes, to-do list, journals & reminders all in one app
Open Source, tasks, bug tracking, agile scrum, timesheet, wiki
Personal organizer focused on usability and user productivity
The most popular mindmapping and brainstorming software
A tool for tracking tasks of repetitive manual processes
Cross-platform desktop bookmarking tool
A simple school planner
a java based sticky notes
Cosas is a web emulation of the GTD app Things