Sheet2Site is described as 'Generate a website from Google Sheets' and is a Website Builder in the development category. There are four alternatives to Sheet2Site for Online / Web-based and SaaS. The best alternative is Spreadsheet 2 Site. It's not free, so if you're looking for a free alternative, you could try Sheetpages or SpreadSimple.
Sheet2Site is mainly a Website Builder but alternatives to it may also be Spreadsheet Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Sheet2Site.
SpreadSimple uses the data in your Google spreadsheet to create styled websites with a variety of customisable features such as search, sorting, filtering, cart collection, SEO, custom scripts and others.