I’m always covering new robotic technology that aims to help people with disabilities here on the blog.
ProDigits from TouchBionics is actually a finger replacement costumized according to the owner needs:

I’d say it’s pretty interesting, but as far as technology goes, I think I’ve seen better working stuff out there.
But I can’t remember if it was commercially available.
Anyways, it’s always nice to see people working on stuff like that, so there you are.

Source: Gizmodo