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.
TextPad - TextPad is a powerful, general purpose editor for plain text files that is easy to use, with all the features a power user requires.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
Falcon - Ultraportable 2-in-1 Laptop
Turtl - The secure, collaborative notebook
TiddlyWiki - a non-linear personal web notebook