Open Source Rust Emulators

Ruffle is an open-source emulator for Adobe Flash Player, written primarily in Rust, and targeted at both desktop applications and web browsers via WebAssembly. Its goal is to enable legacy Flash content—animations, games, interactive media—to continue running safely and reliably after official Flash support was discontinued. On the web side, Ruffle is embedded into pages or installed as a browser extension; in the desktop version, it can open .swf files directly or embed them in applications. Because it’s built with memory safety in mind, Ruffle helps avoid many of the security vulnerabilities that plagued classic Flash (buffer overflows, use-after-free, etc.). It strives to support multiple versions of ActionScript (1, 2 and parts of 3) and a wide swath of the Flash API so as much content as possible works unchanged.

v86 is an open-source x86 PC emulator that runs entirely in the browser using WebAssembly for near-native performance. It translates x86 machine code into WebAssembly at runtime, enabling users to boot and run full operating systems without installing anything locally. The emulator supports a wide range of legacy systems, including Linux, Windows 95/98/2000, FreeDOS, and various experimental OSes. It simulates essential hardware components such as CPU, memory, VGA graphics, sound cards, network adapters, and storage controllers. Designed for both experimentation and embedding, v86 can be integrated into web apps or used as a standalone virtual machine environment. Overall, it provides a powerful way to explore operating systems, retro computing, and low-level system behavior directly from a web browser.

ForPC is a universal compatibility platform for Windows that lets you run virtually any game or software ever created, regardless of the original hardware it was designed for. At its core, ForPC bundles a curated collection of the best emulation backends available, automatically selecting the right one for your software with zero configuration required. Beyond emulation, ForPC includes a native binary translation engine that converts foreign CPU architectures directly into Windows x64 code, delivering near-native performance for supported platforms. Think of it as a single hub where your entire library, spanning every console, computer, and arcade system ever made, lives in one place. ForPC features a clean library interface with cover art, metadata, save state management, controller support, cheat codes, and shader presets. Whether you are revisiting a childhood classic or exploring software history, ForPC makes it simple.

Mohanson GameBoy is a minimalist Game Boy emulator project focused on clarity, experimentation, and educational value rather than full compatibility or performance optimization. It is designed as a clean implementation of the Game Boy architecture, typically written in a high-level language such as Python or Rust depending on the version, making it approachable for developers studying emulator design. The project emphasizes core components such as CPU instruction decoding, memory management, and basic graphics rendering, providing insight into how the original hardware operates. It is often used as a learning tool for understanding low-level system emulation, including timing, interrupts, and cartridge handling. Compared to more advanced emulators, it may lack full feature parity or optimization, but it compensates with readability and conceptual transparency. Its modular structure allows developers to extend or modify individual components for experimentation.

Mooneye GB is a Game Boy research project and emulator written in Rust. The main goals of this project are accuracy and documentation. Some existing emulators are very accurate (Gambatte, BGB >= 1.5) but are not documented very clearly, so they are not that good references for emulator developers. I want this project to document as clearly as possible why certain behavior is emulated in a certain way. This also means writing a lot of test ROMs to figure out corner cases and precise behavior on real hardware. The emulator is lagging behind hardware research. I don't want to spend time making short-lived and probably incorrect fixes to the emulator if I'm not sure about the hardware behavior. On an i7-3770K desktop machine, I can usually run ROMs with 2000 - 4000% speed. Without optimizations, the speed drops to 150 - 200%, which is still fine for development purposes.