The best alternatives to StaticWeb Studio are Gatsby, Carrd, and Softr. If these 3 options don't work for you, we've listed a few more alternatives below.
Softr turns your spreadsheets (Airtable, Google Sheets) and databases into customer portals, internal tools, and any other custom app. Pick a template or start from scratch.
Sitesauce converts your dynamic websites into static sites, so you can keep your existing workflow while enjoying all the benefits static sites provide.