ReText is a cross-platform WYSIWYG-ish Markdown editor.

Growing Rails Applications in Practice

Check out our e-book. Learn to structure large Ruby on Rails codebases with the tools you already know and love.

• Introduce design conventions for controllers and user-facing models
• Create a system for growth
• Build applications to last

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Toggle editor and preview layout with Ctrl+E.\
Press Ctrl+L to split the window for a live preview.

I use it to copy Pivotal Tracker story descriptions over, switch to the preview and have it as a small always-on-top window in a corner of one of my screens.

On Ubuntu, you can use a PPA to install:

sudo add-apt-repository ppa:mitya57/ppa
sudo apt-get update
sudo apt-get install retext