Tomboy - Apps/Tomboy - GNOME Wiki!
Grid Diary - The simplest way to get started with keeping a diary
Turtl - The secure, collaborative notebook
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.
Omni Notes - Note taking open-source application aimed to have both a simple interface but keeping smart behavior
Capture 365 Journal - Capture 365 Journal is a beautiful and easy to use diary/journal for the Apple iPhone, iPad, Mac and Android.