What is the most mature and maintained Markdown processor?

Question

I need to Process Markdown at the command line, so there is no real language restriction.

Extra features such as pretty quotes and dashes are a welcome addition. Code blocks are a must, but they are part of the core I think.

I want to output to HTML only, and I'm on a Unix environment.

Answer 1

Pandoc allows you convert Markdown to HTML (and back!) and much more.