Open source note taking and to-do app with synchronization
private digital diary & note taking appliaciton
Apps notes for Windows, iOS and Android, with direct local sync
Windows Companion for the Android App Denkzettel
The Freeplane add-on that syncs a GTD mind map with a todo.txt file
day time reminding android application
A simple school planner
a java based sticky notes
Cosas is a web emulation of the GTD app Things