Typora - A minimal Markdown reading & writing app.
10 Minute Mail - Temporary disposable e-mail service to beat spam. Avoid spam with a free secure e-mail address.
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
Hamster Pad - A social network built on top of Slack
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.
Kaboom by Hotspot Shield - Share messages & photos that disappear on any social network