chitchat - Chat Room with Selfies and Pagers (yes, pagers!)
Typora - A minimal Markdown reading & writing app.
Chalk - Chalk is a calculator that tries to do right what others do wrong.
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
Twist - Check fewer notifications, do more meaningful work. Twist is the team communication app for calmer, more organized, and more productive teamwork.
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.