Turtl - The secure, collaborative notebook
C-Organizer - C-Organizer is a robust software tool designed for the professional manager that permits them to organize business activities altogether.
Omni Notes - Note taking open-source application aimed to have both a simple interface but keeping smart behavior
Info Select - Info Select is a Personal Information Manager that organizes Internet data, notes, to-do's...
Tomboy - Apps/Tomboy - GNOME Wiki!
AllMyNotes Organizer - AllMyNotes Organizer is a multi-functional hierarchical information manager for Windows.