BlueFeather has imported some extension of syntax from PHP Markdown Extra -- definition list, table, and others. And that, BlueFeather has been added original extension -- TOC generation and block separator. See the Markdown Syntax Extension.
require 'bluecloth' puts BlueCloth.new(str).to_html
require 'bluefeather' puts BlueFeather.parse(str)
See the Installing and Basic Usage.
Imported by Maruku, BlueFeather can generate entire html document not only html fragment. And that, document metadata enables to specify title and URL of css-stylesheet.
See the Installing and Basic Usage and Metadata Reference.
These bugs are fixed on BlueFeather.
<firstname.lastname@example.org>' is not parsed such as mailto-anchor. (ex: GMail alias charcters)
<hr />indented 4-or-more spaces or tab is not parsed such as code block.
BlueCloth output empty element tags,
<tag/>. Instead BlueFeather output