Registax is a freeware program that takes video sequences and looks for common data across frames (within reason--they better be all the same object in roughly the same frame position) and stacks the images to remove noise, out of focus bits, then uses wavelets to produce a spectacularly sharp image.
It is supposed to work with individual image collections as well. I have never had any success doing that. The trick is to reduce the size of the images, and save them in a framelist so that they are treated like a video sequence. Then the usual strategy works. Four not terribly sharp images.
After RegiStax:
After unsharp mask in GIMP:
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