Toshi - A browser for the Ethereum network
Storefront UI - The first Vue.js UI library dedicated to eCommerce
MyEtherWallet - MyEtherWallet is a free, open-source, client-side interface.
eCommerce HTML - Bootstrap 5 HTML eCommerce UI Kit
Exodus.io - All-in-one app to secure, manage and exchange blockchain assets.
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.