I have compiled a list of tools you might find helpful for testing structured data markup and rich snippet display (microdata, RDFa, RDFa Lite and JSON-LD)
ArchieML is a text format optimized for human writability. It was designed for users unfamiliar with existing serialization formats, and defines a forgiving, incremental parser that does not throw syntax errors.
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How to use markdown in notepad++
instaview - A Mediawiki to HTML converter in JavaScript; packaged for node and volo.
A list of all markdown parsers in Python. The advantages and
disadvantages of them.
marked - A markdown parser and compiler. Built for speed.
markdown-here - Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render it before sending.