nvALT - A fork of the original Notational Velocity with some additional features and interface modifications

Cool Writer - Cool App for iPhone/iPad, Create/share colorful notes & convert to PDF with any kind of keyboard you can possibly think of. Customize your keyboard, type a series of text by simply tapping a key.

Notational Velocity - Notational Velocity: modeless, mouseless Mac OS X note-taking application

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.

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.

nvPY - nvPY is a note-taking tool inspired by Notational Velocity, nvALT and ResophNotes.