if you want to publish it in GitHub you can use OnToology (http://ontoology.linkeddata.es/) to assign a w3id to it and the redirection will be automatically done to your GitHub repository. OnToology will also help you generating documentation and evaluation for your ontology.
There is also another option in OnToology to download the bundle with the files needed for content negotiation, but in that case you need you set up you own server.
Looks nice as is web based, I wonder if this could be combined with ODK. I will ask them
http://ontoology.linkeddata.es/
from Protege list:
Looks nice as is web based, I wonder if this could be combined with ODK. I will ask them