Hook Markdown into Tablepress with Parsedown http://wordpress.org/plugins/tablepress/ https://github.com/erusev/parsedown

gistfile1.php

<?php
class Client extends Setup
{
	public function __construct()
	{
		add_filter('process_markdown', array($this, 'process_markdown'));
		add_filter('tablepress_cell_content', array($this, 'process_markdown'));
	}

	public function process_markdown($text)
	{
		if ( in_array($text, array('#colspan#', '#rowspan#', '#span#')) ) return $text;

		if ( file_exists(THEMEEXTENSIONS . '/functions/parsedown.php') )
			require_once(THEMEEXTENSIONS . '/functions/parsedown.php');
		else
			return $text;

		$markdown = Parsedown::instance()->parse($text);

		return $markdown;
	}
}

new Client;