Ubuntu - Install Atom Markdown Editor
What is Atom?
The atom editor is great for viewing and editing markdown documents offline. It's opensource and feels remarkably similar to Sublime Text, which is what I think they are going for.
The file extension for a markdown file is ".md" and you may have seen them on the README files in Github.
sudo apt-add-repository ppa:webupd8team/atom -y sudo apt-get update sudo apt-get install atom -y