This is the Markdown plugin for bbPress that I needed, but could not find. It replaces the standard editor with a responsive Markdown form that includes a preview and formatting help. The Markdown is parsed using PHP Markdown(Extra) and saved as a regular HTML bbPress post. The Markdown is saved separately for later editing. The plugin can be activated and deactivated without affecting your bbPress data, it uninstalls cleanly (deleting any saved Markdown code) and is multisite compatible.
“bbP Markdown” is open source software. The following people have contributed to this plugin.