If I'm understanding this right, it would be three or four different editors, where the output from each one can easily be used as an input for the others?
Sounds interesting, but I don't think it's right for me. I haven't ever used packed textures or boned actors. So, question: what sort of development environment is Objecty meant to be used with? Flash, Unity, iOS, ... other stuff that I can't bring to mind right now?
Well that is pretty much what it is yeah! Its designed to work with any enviroment, language or framework. The idea is that you can export the data to your existing engine instead of limiting yourself to the author designed plugin. So for example if your engine currently takes a tilestrip and some predefined constant variables, then there is absolutely no reason you couldn't make a simple exporter to generate this for you.
I will be creating a generic objecty library which hopefully will get ported to various targets over time, but objecty is definitely not limited to just that.