Org mode is simply a markdown language.  You can use it on Github, for example.  Any file that ends in .org will be rendered as org.  README.org, for instance:<p><a href="http:&#x2F;&#x2F;github.com&#x2F;melling&#x2F;SwiftResources&#x2F;blob&#x2F;master&#x2F;README.org" rel="nofollow">http:&#x2F;&#x2F;github.com&#x2F;melling&#x2F;SwiftResources&#x2F;blob&#x2F;master&#x2F;README....</a>