As powerful as Salesforce and Dynamics with greater technology independence and customization.
You may also be interested in ...
Dolibarr
Open Source ERP & CRM for Business (sme or large companies, freelance, foundations).
Seotoaster
SeoToaster is a free Open Source eCommerce CMS.
Pico CSS
Minimal CSS Framework for semantic HTML. Elegant styles for all natives HTML elements without .classes and dark mode automatically enabled.