Markdown has become an essential file format, especially if you are sharing source code on Github or Bitbucket. ReText is a good Markdown editor for Ubuntu. It can be installed easily:
$ sudo apt install retext
I like to use ReText in the live preview mode where the resulting HTML is shown in a pane on the right. So, it acts as an excellent Markdown viewer too. I have no idea why this is not turned on by default.
Tried with: ReText 4.1.2 and Ubuntu 14.04
The markdown format is increasingly used at websites like GitHub. Thus, there is a need for a simple markdown editor that can be used to edit and view markdown files.
MarkdownPad is a markdown editor for Windows which I found does this job well. Just download and install. Associate .md files with MarkdownPad, which can be found as
MarkdownPad.appref-ms in the directory
Tried with: MarkdownPad 22.214.171.124 and Windows 7 Professional x64