Medusa is an open source Node.js headless commerce platform founded in 2020 with 21K+ GitHub stars. Supporting both self-hosting and cloud hosting, it is an open source alternative to Shopify.
Magento (now Adobe Commerce) is an open-source enterprise e-commerce platform founded in Los Angeles, USA in 2007 and acquired by Adobe for $1.68 billion in 2018. The open-source edition is free, modular and deeply customizable, supports multi-store and complete B2B capabilities, serving tens of thousands of merchants.