It's eventually going to be a browser-based client for using social networking sites with bad interfaces in general, but I'm starting with Tumblr, for obvious reasons. Nearly everyone I know over there at this point uses an extension called XKit to force the native Tumblr interface to work*, but there are limits to what browser extensions can do, and it's not yet usable on mobile devices.

Once I've got that polished up enough to be usable, I'm planning to add some tools to help people migrate from Tumblr to other sites easily - crossposting, etc.

(* I started an early version for myself a few months back when I was having really bad visual processing problems and couldn't manage to block all the flashing gifs and videos and shit that are built into the interface. There was a day that I honestly thought the 404 error page was going to give me a seizure.)