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.
Journaly - The customisable journal app
Journal - Organize all your ideas
Journalistic - A simple, yet powerful micro journaling app
Grid Diary - The simplest way to get started with keeping a diary
Happyfeed - A simple gratitude journal for iOS