sleek is a todo.txt manager, free and open-source (FOSS)
An open-source, self-hosted memo hub with knowledge management
Open source note taking and to-do app with synchronization
A meter-based to-do list
A cross platform application to track anything that piles up
An elegant Microsoft ToDo desktop client for Linux (a fork of Ao)
A minimalist Windows desktop sticky note tool
Note taking application, write down your thoughts.
A premier mind-mapping software written in Java
IGSuite is a web-ajax-based Integrated Groupware Suite
Free flexible open source todo manager featuring hierarchical tasks
Simple Online Planning
To-do manager, notepad, RSS reader...
Cross-platform, parametric note-taking application
The Freeplane add-on that syncs a GTD mind map with a todo.txt file
Platformunabhängiger Kalender zum Eintragen von Ereignissen
Windows Companion for the Android App Denkzettel
A simple task planner: quickly add, edit, and delete tasks.
Kunden-, Lieferanten-, Mitarbeiter-, Aktivitäten-, Stundenverwaltung