sleek is a todo.txt manager, free and open-source (FOSS)
Open source note taking and to-do app with synchronization
Free and powerful note-taking application
An open-source, self-hosted memo hub with knowledge management
A cross platform application to track anything that piles up
A meter-based to-do list
Machinery is an asynchronous task queue/job queue
A minimalist Windows desktop sticky note tool
An elegant Microsoft ToDo desktop client for Linux (a fork of Ao)
Note taking application, write down your thoughts.
A premier mind-mapping software written in Java
Free flexible open source todo manager featuring hierarchical tasks
Simple Online Planning
To-do manager, notepad, RSS reader...
Cross-platform, parametric note-taking application
So much to do, so little time...
IGSuite is a web-ajax-based Integrated Groupware Suite
The Freeplane add-on that syncs a GTD mind map with a todo.txt file
Platformunabhängiger Kalender zum Eintragen von Ereignissen