Currently it is my own concoction. Though I am using the Slim framework to take care of routing and loading the "template" files. Working to implement w3.org/TR/micropub so I will be able to fully split work between an editor and the back-end.
Granary should be able to convert my h-feed into an Atom feed, if that is your thing When I have gotten my posting flow to where I want it, I hope to get POSSE in and cross-post to Sublevel. For now that's a low priority though.