Loom - Loom is a screen recording extension for Chrome that gives people the ability to create and share media. Create your own videos using your camera, screen view, and audio. Read more about Loom.
Typora - A minimal Markdown reading & writing app.
recordit.co - Make a short video capture of your desktop as a gif.
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
Bubbles - Drop comment bubbles anywhere on the screen, on any website.
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.