EmulatorJS

RomM is a self-hosted ROM manager and player for organizing an owned game collection. It scans game folders, parses filename tags and naming schemes, and enriches entries with metadata from IGDB, Screenscraper, and MobyGames, with artwork from SteamGridDB. The interface supports metadata for more than 400 platforms, custom tags, multi-disk games, DLCs, mods, hacks, patches, and manuals. RomM can display RetroAchievements progress and play compatible games in a browser through EmulatorJS and RuffleRS. It supports browsing, uploading, updating, and deleting games through a web browser, sharing a library with limited permissions, and official apps or integrations for Playnite, Android, and custom firmware handhelds.

happy-dom is a JavaScript implementation of a web browser without a graphical user interface. It recreates DOM and browser APIs for running and testing browser-dependent code in Node.js and other lightweight environments. Its supported features include custom elements and declarative shadow DOM, mutation observers, tree walkers, and the Fetch API. It works with testing and frontend ecosystems including Vitest, Bun, Jest, Testing Library, LitElement, Vue, React, Svelte, Angular, and web components. happy-dom is distributed under the MIT License. The project is maintained by David Ortner and hosted on GitHub.

Playwright is an open-source framework for web testing and browser automation, developed in the Microsoft repository. It drives Chromium, Firefox, and WebKit through a single API and includes an end-to-end test runner with isolated browser contexts, auto-waiting, web-first assertions, resilient locators, parallel execution, and reusable authentication state. Its tooling also includes a browser-automation library, CLI for coding agents, MCP server for AI-agent and LLM-driven automation, and tracing that records actions, DOM snapshots, network requests, console messages, screenshots, and videos for debugging.

Ember is an operating system written from scratch in NASM assembly for booting from USB media, running DOS software on modern hardware, and providing its own graphical desktop. It includes a boot sector, FAT12/FAT16 filesystem, DOS-compatible INT 21h services, a 32-bit protected-mode runtime, command shell, file manager, word processor, music player, paint program, and other desktop applications. The system loads .COM and .EXE programs, batch files, XMS clients, and DOS/4GW software. Its virtual Sound Blaster is provided through a virtual-8086 monitor for real-mode programs or a DPMI host for protected-mode games; audio is sent through Intel HD Audio, with software OPL3 emulation for FM music. A separate UEFI application, Ember 2.0, supplies a BIOS-compatible layer for systems that cannot boot legacy BIOS code. The repository also includes drivers and applications for touch input, Intel graphics, 3D rendering, screenshots, and QEMU-based testing. Python build scripts and NASM assemble a bootable raw disk image, and the image can be run in QEMU or written to a USB stick. The project is MIT-licensed; its bundled NDOOM component is based on GPL-licensed Doom source, and minimp3 is public domain. The repository documents limitations including no networking or EMS, one active program at a time, and hardware-specific touch, graphics, and 3D support.

V8 is an open-source JavaScript and WebAssembly engine developed by the V8 team at Google and distributed with the Chromium project. It executes ECMAScript by compiling to native machine code using a multi-tier architecture (Ignition interpreter and TurboFan optimizing compiler), provides garbage collection, snapshotting, a C++ embedding API, and is used in Chrome, Node.js, Deno and other C++ hosts. The project is released under a BSD-style license and its official documentation is published at v8.dev.