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.

Turtl - The secure, collaborative notebook

OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.

Carnet - Opensource rich text note taking app