What I want is a unit which can be attached to the serial port of my board and used to program the processor. This device would contain it's own processor and memory and operate independently not requiring a PC except to load the hex file to be programmed.
Yes I have Googled half the day with nothing to show for my effort. There are any number of AVR devices but alas nothing I saw would work.
There are several stand-alone JTAG programmers but I need to put these in the hands of salesmen and I would expect problems.