We are happy to announce that we have released a beta version of our tools to create customizable content for 3d games. You can check it out at http://anticto.com .
We are the tiny middleware company Anticto and we are developing Mutable: a dynamic content system very suited to create customizable characters in MMOs. It is multiplatform, integrated in some commercial engines (we are always open to add more) and efficient.
If you want to know more, just go to the website or ask me anything here. There is a 10 minutes explanation in an old youtube video before the new version and new name (it was previously called "Monstre") here.