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js-buy-sdk
The JS Buy SDK is a lightweight library that allows you to build ecommerce into any website. It is based on Shopify's API and provides the ability to retrieve products and collections from your shop, add products to a cart, and checkout.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
This is not completely true. This depends on what kind of development resources you have access to. Shopify has very robust APIs that allow you to build what ever storefront you can imagine - and by implementing something like The Shopify Buy SDK into your website or application, this can also be hosted wherever you want (A headless ecommerce store). You just use Shopify for its checkout. WooCommerce has a hard time competing with this (it can be done, but it doe not come close to comparing at the moment).