Can't have a conversation involving servos without mention of these guys:
https://www.servocity.com
They have a UART to servo controller that might fit your bill: (and lots of
other fiddly bits)
https://www.servocity.com/html/servo_controllers.html#.VUuCdvlVhBc

Then there's these guys
https://www.pololu.com
They have several servo controller options:
https://www.pololu.com/category/12/rc-servo-controllers

I've bought other stuff from both of them in the past. They seem decent.

But I have to say - controlling an RC servo is pretty much dead easy.
Pretty much any microcontroller and about ten minutes of code...


-Denny
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