Open Source JavaScript Browsers

ZK is an open-source Java framework for building modern web and mobile applications. It enables developers to create rich, interactive UIs using only Java — no JavaScript required. With 200+ Ajax-powered components, event-driven architecture, and support for popular technologies like Spring, Java EE, and JSP/JSF, ZK makes it simple to deliver powerful and user-friendly web applications.

Stackpeek is a free, open-source browser extension that shows what any Shopify storefront is built on. Click its icon and a side panel names the theme -- with its version, creator and price -- the apps behind the store, grouped by the job they do, and the advertising and analytics pixels the page loads, each named rather than counted as a total. It also exports the store's public product catalogue to CSV in Shopify's own product-import format: every public product and variant, up to the first 10,000, assembled in your browser. Detection is reported honestly. Weak app matches are marked unverified rather than dropped, unknown hosts are counted so gaps stay visible, and a customized, bespoke or headless build is labelled as such instead of being guessed at. Four permissions, no account, no sign-up, and your browsing history is not collected. The full source is MIT licensed and published, so every claim here is checkable against the code. Not affiliated with Shopify Inc.