makehumancommunity.org

I found this on the web: http://vestan.github.io/
I'm not the author, but I just thought that it might interest others of the community.
It allows you to select a UV map, or something else as alpha mask, and then add and blend layers of skin textures together, to create a new skin texture.

It's fully open source and the code is available on github (see about on the webpage).

Thank you duststorm for this very useful link! The application is very simple to use and if you are not so good with uvmapping its the nicest way for making new skins and integrating them in MH. Thank you to Manuel Bastioni for this development.