Turtl - The secure, collaborative notebook
My Notes Keeper - Home Of My Notes Keeper - My Notes Keeper is the premier note/outliner application for Windows 9x/2000/XP/NT. It allows you to store all of your notes and information in an easy-to-use outline, where you can quickly find what you need.
Tomboy - Apps/Tomboy - GNOME Wiki!
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
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.