Can I replace the WYSIWYG editor with a markdown editor? If so, what plugin can I use?
Below are the methods you can try. The first solution is probably the best. Try others if the first one doesn’t work. Senior developers aren’t just copying/pasting – they read the methods carefully & apply them wisely to each case.
I’m not sure about the version of Markdown, but here’s some plugins
I use markdown-for-wordpress-and-bbpress to get wordpress to render posts and comments in markdown format.
For editors, I prefer markdown-quicktags. It has a bunch of auto-complete features, and seems to be the most actively updated markdown editor plugin. You might also try wmd-admin for the wmd editor (Same markdown editor as the stackexchange) or wp-markitup (not markdown specific)
You can use Markdown on Save, by Mark Jaquith.
Allows you to compose content in Markdown on a per-item basis. The markdown version is stored separately, so you can deactivate this plugin any time.
Not mentioned is WP-Markdown or Markdown on Save Improved.
I did look at Markdown for WordPress and BBPress but apparently it hasn’t been updated since 2008 and never went beyond version 1.0.