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"Runtime" - Character Creation/Customization Library
Did you already check the Unity Asset Store? I have nothing I could recommend as I never really looked for it, but I have a hard time believing there is NOTHING in the asset store (if UMA is the only thing, then bad luck I guess).
That being said, why not go the DIY route? I have seen at least one tutorial for Unity for creating Character customizations. Don't know if I will find the link again...
But a short Google search turned up this: http://answers.unity3d.com/questions/44234/advanced-character-customization.html
Maybe have a look at this CakeWalk asset in the store... IF it is still around.