Day One - A simple journal application for the Mac, iPhone, and iPad. AboutTo learn more about Day One, see these two excellent reviews . PublishPublish is not available in Day One 2.
Diarly - Secure, simple & beautiful diary app.
Journal - Organize all your ideas
Journalistic - A simple, yet powerful micro journaling app
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.
Happyfeed - A simple gratitude journal for iOS