journal-cli makes it super easy to keep a well-organized journal that can be instantly indexed, searched, and browsed all from your terminal window.
Pepys Alternatives
Pepys is described as 'Journaling application that utilises markdown for writing and storing the journal entries' and is a Journaling app. There are more than 100 alternatives to Pepys for a variety of platforms, including iPhone, iPad, Android, Web-based and Android Tablet apps. The best Pepys alternative is memoria — private journal. It's not free, so if you're looking for a free alternative, you could try Reset or Day One. Other great apps like Pepys are Journalistic, Journey, Recollect and Diarium.