C-Organizer - C-Organizer is a robust software tool designed for the professional manager that permits them to organize business activities altogether.

Tomboy - Apps/Tomboy - GNOME Wiki!

MSD Organizer - MSD Organizer one of the best software providing you a personalized experience with the complete visibility of the personal and professional manager.

Omni Notes - Note taking open-source application aimed to have both a simple interface but keeping smart behavior

AllMyNotes Organizer - AllMyNotes Organizer is a multi-functional hierarchical information manager for Windows.

Turtl - The secure, collaborative notebook