DocGist is a tool that renders AsciiDoc documents fetched from GitHub gists or other sources. The rendering is performed in the browser using the asciidoctor.js library. The original use case for this was http://gist.neo4j.org/ which has additional features to create examples for the Neo4j graph database.
How To Use
Create/locate a gist on GitHub (or use a file in Dropbox).
Write text using AsciiDoc syntax in it.