V8 JavaScript engine

Moli is an open-source headless browser engine built in Rust for AI agents. It fetches and extracts web pages, searches the web, and automates browser tasks while providing JavaScript, DOM, CSS, networking, storage, and browser automation capabilities. Moli treats the DOM as the source of truth and performs layout and rendering on demand, so DOM-first operations can avoid visual layout and paint. Layout enables geometry queries, coordinate input, screenshots, screencasts, and PDF output. It can be used through its CLI, CDP, WebDriver Classic, and WebDriver BiDi interfaces, including direct connections from Playwright over CDP, and supports Linux, macOS, and Windows.

Browser Use Pi is a TypeScript web agent built on Pi Mono. It combines a persistent V8 REPL with raw Chrome DevTools Protocol control: the agent writes JavaScript, uses accessibility-tree data and screenshots, and builds browser helpers as needed. It supports persistent sessions, saved logins, workspaces, streaming, hooks, typed results, follow-up tasks, and cloud browsers or a user's own Chrome; runs can be limited by steps, time, or cost, with partial work retained. Interaction highlights, recordings, and GIF exports can show the agent's work. It is distributed as the @browser_use/pi package for Node 22.19+ or Bun 1.3.14+, and its quickstart uses Browser Use Cloud without requiring a local Chrome installation.

Falco is a tiny browser engine written from scratch in Rust. It parses HTML, applies CSS, executes JavaScript in a custom virtual machine with a baseline JIT compiler, loads images, computes layout, and paints the result to a canvas that can be exported as PNG or displayed in a live interactive window. Its rendering pipeline runs from HTML through the DOM, style and layout trees, paint commands, and a canvas; the interactive mode supports scrolling, link navigation, form filling, and browsing history. The project includes its own HTML and CSS parsers, layout engine, SVG renderer, image loader, PNG encoder, WebAssembly interpreter, networking layer, and JavaScript DOM bindings, rather than wrapping WebKit, Gecko, or Chromium.

Lightpanda Browser is a headless browser built from scratch in Zig for AI agents and web automation. It is not based on Chromium, Blink, or WebKit; its implementation includes an HTML parser, V8 JavaScript support, a DOM tree and APIs, network loading, cookies, form input, proxy support, network interception, and optional robots.txt compliance. It can dump pages as HTML, Markdown, PNG, or PDF, or expose a Chrome DevTools Protocol and WebDriver BiDi server for clients such as Puppeteer and Playwright. Its native agent mode uses an LLM to navigate pages, click through flows, fill forms, and extract structured data. Sessions can be exported as deterministic, token-free PandaScript JavaScript and replayed without a model at runtime. The browser also provides an MCP server over stdio or HTTP, with isolated or shared browsing sessions for multiple agents. The project distributes nightly binaries for Linux and macOS, Docker images for Linux amd64 and arm64, and packages for Homebrew and the Arch User Repository. It can also be built from source with Zig and its V8, Libcurl, and html5ever dependencies.

Electron is an open-source framework for building cross-platform desktop applications with JavaScript, HTML, and CSS. It is built on Node.js and Chromium, provides binaries for macOS, Windows, and Linux, and is used by applications such as Visual Studio Code. The project is MIT-licensed, maintained under the OpenJS Foundation, and distributed via npm.