There are several platforms that allow you to build a free online store or eCommerce website. Here are some of the most popular ones:

  1. Shopify: Shopify offers a free 14-day trial period, which allows you to build and launch your online store. After the trial period, you’ll need to choose a paid plan that fits your needs.
  2. WooCommerce: WooCommerce is a free plugin for WordPress that allows you to build an eCommerce website. You’ll need to have a WordPress website first before installing WooCommerce.
  3. Big Cartel: Big Cartel offers a free plan that allows you to sell up to 5 products. If you want to sell more products, you’ll need to choose a paid plan.
  4. Square Online: Square Online offers a free plan that allows you to build and launch your online store. You’ll need to pay transaction fees on each sale you make.
  5. Ecwid: Ecwid offers a free plan that allows you to sell up to 10 products. If you want to sell more products, you’ll need to choose a paid plan.
  6. Wix: Wix offers a free plan that allows you to build a website, but it does not include eCommerce functionality. If you want to sell products on your website, you’ll need to choose a paid plan.
  7. Weebly: Weebly offers a free plan that allows you to build a website with limited eCommerce functionality. If you want to sell more products, you’ll need to choose a paid plan.

Before choosing a platform, make sure to check their features, pricing plans, and transaction fees to see which one best fits your needs.