Zerene Stacker is described as 'Is “focus stacking” software designed specifically for challenging macro subjects and discerning photographers. Of course it works great with simpler subjects, close-ups, and landscapes also!' and is an app. There are five alternatives to Zerene Stacker for Windows, Mac and Linux. The best Zerene Stacker alternative is Affinity, which is free. Other great apps like Zerene Stacker are Shine Stacker, Enblend/Enfuse, DSLR Bracketeer and Helicon Focus.
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Shine Stacker is a focus stacking application for microscopy, macro photography, and computational imaging.
Enblend combines images that overlap into a single large image with no seams. Enfuse combines images that overlap into a single image with good exposure and good focus.
Enblend/enfuse does not do focus stacking
DSLR Bracketeer is a simple program for automatic focus bracketing on Canon EOS DSLR cameras. It is used for macro photography mostly.
Helicon Focus is an image editing software that creates one completely focused image from several partially focused images by combining the focused areas. The program is designed for macrophotography, microphotography and landscape photography when sharpness from zero to...
I have tried both Helicon and Zerene for moth photography. I found Zerene gave me best results.
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FOSS focus stacker with results comparable to Helicon and Zerene