Unofficial Evernote client for Linux desktop
PHP & MySQL/SQLite -based Project Management System
The Freeplane add-on that syncs a GTD mind map with a todo.txt file
Todo task manager with simple, fast and intuitive user interface
a free mind mapping tool, to especially assist decision making
Adam - information management platform
Program for manipulating with mind maps
Generate Work Breakdown Structures (WBS) in Excel.
Manage Your Tasks Easily
Lightweight task manager