Depfu helps teams that use Ruby and Rails to keep their dependencies up to date by creating Pull Requests on your Repos on GitHub with the updates that are coming in via rubygems.org. It is inspired by greenkeeper, which does the same thing for JavaScrip projects using npm.
Today, Depfu is on ProductHunt. If you want to support us, me or Depfu (or ideally: All of them), you probably know what to do.
This day is an experiment, as we have temporarily borrowed some really loud loudspeakers and want to create as much buzz as possible. If we can get that done, it will probably help us a great deal in bringing Depfu forward on the path to sustainability, which is, of course, our long term goal.