Open source note taking and to-do app with synchronization
Free and powerful note-taking application
Simple Online Planning
The Freeplane add-on that syncs a GTD mind map with a todo.txt file
Sticky notes/post-it application for linux
PWM let you organize your project in a Web 2.0 way.
MNoteLite is a simple todo manager
Helps for better management of office mails at central mailroom
Extended desktop Markdown and Todo.txt editor for Windows
Where do you want to shop today? Deluxe Manager for Shoppinglists.
Open Source, tasks, bug tracking, agile scrum, timesheet, wiki
Cross-platform desktop bookmarking tool
A time tracking application for desktop users