Helicon Focus is described as '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' and is a raw photo editors in the photos & graphics category. There are seven alternatives to Helicon Focus for Windows, Linux and Mac. The best Helicon Focus alternative is Affinity, which is free. Other great apps like Helicon Focus are Shine Stacker, Enblend/Enfuse, Zerene Stacker and DSLR Bracketeer.
FOSS focus stacker with comparable results to Helicon and Zerene