Moodnotes - Capture your mood and improve your thinking habits
Typora - A minimal Markdown reading & writing app.
tinythoughts - Keeping a journal is hard. tinythoughts makes it easy.
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
Moodprint - Effortlessly track and analyze your moods over time
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.