I suppose our communication around Titan has caused some confusion after the acquisition by DataStax. As one of the Titan devs I can say that we have no plans to abandon Titan. What we were trying to say is that we will have less time to dedicate to the project in order to encourage others in the community to step up and contribute. That has happened. Over the last couple of months, other Titan users have actively helped out on the mailing list to get newcomers started and contributed bugfixes and features via pull requests. This has allowed us to keep the Titan 1.0 release on its original plan date. What we are trying to do is make the Titan project less dependent on Dan and myself and more open and inviting to other developers who wish to contribute. For instance, we have dedicated more time than usual to reviewing PRs then before. I realize there is still more work that we need to do here but so far the increased contributions have been an encouraging sign that we are heading in the right direction. So, Titan is here to stay and - as others have pointed out - there is more momentum than ever behind the project.

It's not abandonned, they are working on releasing a new version [1] and amazon support officially a backend for dynamodb [2] and IBM use it too [3]

[1] https://groups.google.com/forum/#!topic/aureliusgraphs/A53p9...

[2] http://www.allthingsdistributed.com/2015/08/titan-graphdb-in...

[3] It seems like IBM forked the project

Titan 1.0 will be released this month (September). It will support TinkerPop 3.0.1.