Free Virtual Keyboard - Free Virtual Keyboard is a free, lightweight, multilingual and finger friendly virtual keyboard.
Typora - A minimal Markdown reading & writing app.
Hot Virtual Keyboard - A replacement for Windows' built in virtual touch keyboard.
Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber
KeyScrambler - Home of KeyScrambler, the world's most advanced anti-keylogging system.
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.