RetroArch is described as 'A portable, fast, and lightweight emulator frontend supporting classic and modern gaming systems with features like real-time rewinding and shader support' and is a very popular Game Emulator in the gaming software category. There are more than 100 alternatives to RetroArch for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best RetroArch alternative is DuckStation, which is free. Other great apps like RetroArch are Lemuroid, PlayOnLinux - PlayOnMac, OpenEmu and Lakka.
DuckStation is an simulator/emulator of the Sony PlayStation(TM) console, focusing on playability, speed, and long-term maintainability.
Lemuroid is an open-source emulation project based on Libretro. It's completely free, without ads and focused on ease of use and good user experience.
PlayOnLinux is a graphical frontend for the Wine software compatibility layer which allows Linux and Mac users to install Windows-based video games, Microsoft Office (2000 to 2010), Microsoft Internet Explorer, as well as many other applications.
Open Emu is an open source project to bring game emulation to OS X as a first class citizen, leveraging modern OS X technologies such as Cocoa, Core Animation and Quartz, and 3rd party libraries like Sparkle for auto-updating.
Lakka is the official Linux distribution of RetroArch and the libretro ecosystem. Each game system is implemented as a libretro core, while the frontend RetroArch takes care of inputs and display.
VisualBoyAdvance (VBA) is a free software (GNU GPL) emulator targeted for the Game Boy, Super Game Boy, Game Boy Color, and Game Boy Advance handheld game consoles sold by Nintendo.
Ludo is an Emulator Frontend able to run retro video games. Ludo does not emulate the consoles itself, but does it through emulator plugins called libretro cores. Libretro cores are well known emulators (like Snes9x or Genesis Plus GX or PCSX) stripped from their user interface.
ScummVM is a program which allows you to run certain classic graphical point-and-click adventure games, provided you already have their data files.
Run PSP games across platforms in crisp HD, enjoy sharper textures, post-processing effects, anisotropic filtering, save or restore progress, customize input controls, transfer existing saves, play on low-spec devices with JIT-optimized performance, and more features.
Delta is an iOS emulator that supports multiple game systems such as NES, SNES, N64, and DS, improving upon its predecessor, GBA4iOS.
Cross-platform utility enables seamless installation and execution of Windows applications on macOS, Linux, and Chrome OS. No Windows license required—facilitates easy app management with a few clicks, eliminates the need for virtual machines and reboots, delivering efficient compatibility layer operation.
Vita3K is the world's first functional experimental open-source PlayStation Vita emulator for Windows, Linux and macOS.
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DuckStation is an emulator, whereas RetroArch is a front-end for multiple emulators and the games using them.