I don't know exactly what you looking for but there exsist little programming devices with a memorycard and an ISP connector.
Put the program for the AVR on the memorycard, connect the ISP connector and push a button on the programming device.
The program on the card will be transfered to the AVR and the job is done.
Works perfectly in the field.
I believe there is some kind of project here on the forum so you can build it yourself (if that is what you are looking for).
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