There was recently a request from Alexander Patrikalakis in JIRA (that issues is now closed in favor of this thread) to add JanusGraph to the provider index of the TinkerPop home page. I think that makes sense, though at this time JanusGraph hasn't made a release yet that I'm aware of which basically means that it's not quite yet in compliance with our listing policies.
http://tinkerpop.apache.org/policy.html We don't always enforce those policies to the letter of their wording (thus far they have been more like general guidelines) and I assume that a JanusGraph release is likely a reasonably high priority right now for that project. Anyone have any strong feelings one way or another on adding JanusGraph given our policies?