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Browse free open source C++ System Software and projects below. Use the toggles on the left to filter open source C++ System Software by OS, license, language, programming language, and project status.

  • Gen AI apps are built with MongoDB Atlas Icon
    Gen AI apps are built with MongoDB Atlas

    The database for AI-powered applications.

    MongoDB Atlas is the developer-friendly database used to build, scale, and run gen AI and LLM-powered apps—without needing a separate vector database. Atlas offers built-in vector search, global availability across 115+ regions, and flexible document modeling. Start building AI apps faster, all in one place.
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  • Yeastar: Business Phone System and Unified Communications Icon
    Yeastar: Business Phone System and Unified Communications

    Go beyond just a PBX with all communications integrated as one.

    User-friendly, optimized, and scalable, the Yeastar P-Series Phone System redefines business connectivity by bringing together calling, meetings, omnichannel messaging, and integrations in one simple platform—removing the limitations of distance, platforms, and systems.
    Learn More
  • 1
    99 Nights In The Forest Script [Keyless]

    99 Nights In The Forest Script [Keyless]

    99 Nights Script Keyless: Kill Aura, Auto Combat, Auto Craft, & more.

    This is Keyless Script work Only 99 Nights in The Forest Roblox Game. We tested the script using Xeno Executor, and it works perfectly. Therefore, for your convenience, the script comes with an injector that is perfectly suited for it. In this case, it is Xeno. In addition, this script does not require a key, so you can use it without any problems.
    Downloads: 8,702 This Week
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  • 2
    vJoy
    This project was originally designed to provide an open-source replacement for PPJoy. The product, at this point, consists of virtual joystick devices that is seen by the system as a standard joystick but its position-data is written to it by a feeder application. An existing feeder application that takes advantage of this product is SmartPropoPlus. If you are an application writer you can very easily write an application that controls a joystick (e.g. mouse-to-joystick, keyboard-to-joystick). If you are a beginner in device drivers you can take this code and enhance it to support more (or less) axes, buttons or POVs.
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    Downloads: 7,090 This Week
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  • 3
    Nestopia
    A portable and cycle-accurate NES/Famicom emulator written in C++
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    Downloads: 2,213 This Week
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  • 4
    DeSmuME

    DeSmuME

    DeSmuME is a Nintendo DS emulator

    DeSmuME is the most seasoned open source Nintendo DS emulator. It sports tools designed for hackers, speedrunners, youtubers, and casual gamers. Homebrew programs are supported and can even be debugged through GDB. The Windows and OSX versions are both relatively feature rich, and there is a small universe of forks and mods that add even more features for casual gaming. DeSmuME is the origin of RetroArch and OpenEmu Nintendo DS support and is used by several mobile Nintendo DS emulators, with the notable exception of DraStic. DeSmuME's source code is now hosted at https://github.com/TASVideos/desmume/ win32 autobuilds @ https://ci.appveyor.com/project/zeromus/desmume/build/artifacts
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    Downloads: 1,483 This Week
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  • Dominate AI Search Results Icon
    Dominate AI Search Results

    Generative Al is shaping brand discovery. AthenaHQ ensures your brand leads the conversation.

    AthenaHQ is a cutting-edge platform for Generative Engine Optimization (GEO), designed to help brands optimize their visibility and performance across AI-driven search platforms like ChatGPT, Google AI, and more.
    Learn More
  • 5
    Prism Launcher

    Prism Launcher

    Custom launcher for Minecraft to easily manage installations

    An Open Source Minecraft launcher with the ability to manage multiple instances, accounts, and mods. Focused on user freedom and free redistributability. Install and launch modpacks easily, while keeping them clean. No longer do you need to manually install them, and easily update mod packs, Prism Launcher can do these tasks for you, without installing tons of separate launchers. Prism Launcher is able to download & update individual mods from outside of modpacks using Modrinth and CurseForge. Each Minecraft instance has its own folder, with separate mods, resource packs and other things. You don't need an embedded web browser as a game launcher. Prism Launcher uses the Qt toolkit, which requires little system resources. Prism Launcher also lets you customize the menu and supports custom themes.
    Downloads: 299 This Week
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  • 6
    MultiMC

    MultiMC

    Launcher for Minecraft that allows you to easily manage installations

    MultiMC is an alternative launcher for Minecraft. It allows you to have multiple, cleanly separated instances of Minecraft (each with their own mods, resource packs, saves, etc) and helps you manage them and their associated options with a simple and powerful interface.
    Downloads: 289 This Week
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  • 7
    Citra

    Citra

    A Nintendo 3DS Emulator

    Citra is an experimental open-source Nintendo 3DS emulator/debugger written in C++. It is written with portability in mind, with builds actively maintained for Windows, Linux and macOS. Citra emulates a subset of 3DS hardware and therefore is useful for running/debugging homebrew applications, and it is also able to run many commercial games! Some of these do not run at a playable state, but we are working every day to advance the project forward. (Playable here means compatibility of at least "Okay" on our game compatibility list.) Citra is licensed under the GPLv2 (or any later version). Refer to the license.txt file included. Please read the FAQ before getting started with the project. If you want to contribute please take a look at the Contributor's Guide and Developer Information. You should also contact any of the developers in the forum in order to know about the current state of the emulator because the TODO list isn't maintained anymore.
    Downloads: 242 This Week
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  • 8
    PPSSPP

    PPSSPP

    A cross-platform PSP emulator

    PPSSPP is an open source, cross-platform PSP emulator which allows you to play your PSP games on Android, Windows, Mac or Linux. With PPSSPP you can play your PSP games on your PC in full HD resolution, or play on your tablet for a big-screen mobile gaming experience. PPSSPP enhances the gaming experience in more ways than one. It even upscales some textures that would otherwise be too blurry due to the fact that they were originally made for the small screen. Even on modern Android phones and tablets you can enjoy double the original resolution. Get a whole new and better PSP gaming experience with PPSSPP now!
    Downloads: 151 This Week
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  • 9
    Roblox Shaders

    Roblox Shaders

    Roblox Shader – Download on Any GPU

    Roblox Shader – Universal Graphics Enhancement for All GPUs Roblox Shader is a high-performance, universal shader mod designed to enhance Roblox graphics with realistic lighting, shadows, and post-processing effects. This shader pack is optimized for all graphics cards, including NVIDIA, AMD, and Intel GPUs, ensuring compatibility across virtually any system. Whether you're looking to improve Roblox visuals with better lighting or want a more immersive gaming experience, Roblox Shader delivers stunning results with minimal performance impact. Easy to install and remove, this shader is perfect for players who want to customize Roblox graphics without needing advanced technical knowledge. Why Choose Roblox Shader? If you're searching for a Roblox shader that works on every graphics card and improves visual quality without slowing down your system, Roblox Shader is the ultimate choice. Boost your Roblox experience today! Tags: Roblox Shader, Roblox Graphics Mod,robloxs shaders
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    Downloads: 834 This Week
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  • AI-based, Comprehensive Service Management for Businesses and IT Providers Icon
    AI-based, Comprehensive Service Management for Businesses and IT Providers

    Modular solutions for change management, asset management and more

    ChangeGear provides IT staff with the functions required to manage everything from ticketing to incident, change and asset management and more. ChangeGear includes a virtual agent, self-service portals and AI-based features to support analyst and end user productivity.
    Learn More
  • 10
    Proton

    Proton

    Compatibility tool for Steam Play based on Wine and other components

    Proton is a tool for use with the Steam client which allows games which are exclusive to Windows to run on the Linux operating system. It uses Wine to facilitate this. Most users will prefer to use Proton provided by the Steam client itself. The source code is provided to enable advanced users the ability to alter Proton. For example, some users may wish to use a different version of Wine with a particular title. As the new Steam Play is still in Beta, it is recommended that you opt into the Steam Client Beta for the latest features and fixes. Proton works best with the latest graphics drivers. For some cutting edge games and graphical features, you may need drivers newer than what your distribution ships. Install and play games! We strongly recommend that most users use the production build of Proton.
    Downloads: 96 This Week
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  • 11

    VisualBoyAdvance

    An emulator for Gameboy and GameboyAdvance systems

    An emulator for Gameboy and GameboyAdvance systems.
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    Downloads: 505 This Week
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  • 12
    PCSX2

    PCSX2

    The Playstation 2 emulator

    PCSX2 is a free and open-source PlayStation 2 (PS2) emulator. Its purpose is to emulate the PS2's hardware, using a combination of MIPS CPU Interpreters, Recompilers and a Virtual Machine that manages hardware states and PS2 system memory. This allows you to play PS2 games on your PC, with many additional features and benefits. The PCSX2 project has been running for more than ten years. Past versions could only run a few public domain game demos, but newer versions can run most games at full speed, including popular titles such as Final Fantasy X and Devil May Cry 3. Visit the PCSX2 compatibility list to check the latest compatibility status of games (with more than 2500 titles tested), or ask for help in the official forums. The latest officially released stable version is version 1.6.0. Installers and binaries for both Windows and Linux are available from our website.
    Downloads: 63 This Week
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  • 13
    VBA-M

    VBA-M

    A merge of the original Visual Boy Advance forks

    The continuing development of the legendary VBA gameboy advance emulator.
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    Downloads: 218 This Week
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  • 14

    nestopiaue

    Nestopia UE

    This project is a fork of the original Nestopia source code, plus the Linux port. The purpose of the project is to enhance the original, and ensure it continues to work on modern operating systems.
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    Downloads: 259 This Week
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  • 15
    Denise

    Denise

    C64/Amiga emulator with shader and runAhead

    Denise is a cycle accurate and platform independant C64 / Amiga 500/1000 emulator. My motivation for this project is understanding how it works and write clean and easy readable code. RetroArch SLANG shaders are supported by Denise. Features already known from the C64 emulation, such as runAhead, savestates, drive sounds, PAL encoding, dynamic rate control, G-Sync/FreeSync, Warp, just in time polling are also available for the Amiga. Denise supports SuperCPU, Final Chesscard, REU, GeoRam, EasyFlash, EasyFlash³, Gmod2, Retro Replay, Action Replay, Final Cartridge, Light Guns/Pens, GunStick, Mouse 1351, Mouse Neos, Paddles, fast loaders such as ProfDOS, PrologicDOS, DolphinDOS, ProSpeed 1571, Turbo Trans, 1571, 1581, drag'n'drop and command line support. GIT repo: https://bitbucket.org/piciji/denise/src/master
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    Downloads: 198 This Week
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  • 16
    AIO-Switch-Updater

    AIO-Switch-Updater

    Update your CFW, cheat codes, firmwares from your Nintendo Switch

    A Nintendo Switch homebrew app to download and update CFWs, FWs and cheat codes. Supports Atmosphère, ReiNX and SXOS. Works on unpatched (Erista) and patched (v2/Mariko) Switches. Update the Atmosphère Switch Custom Firmware. AIO-Switch-Updater uses a custom RCM payload to finalise the install as it can't be performed while HOS is running. Download and update Hekate, as well as a selection of RCM payloads. Download and extract daily-updated cheat code. The program will only extract cheat codes for the games you own. By default, this homebrew will overwrite the existing cheats. If you have your own cheat files that you'd like to keep as is, you can turn off cheat updates for specific titles.
    Downloads: 42 This Week
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  • 17
    MIDIPlusPlus

    MIDIPlusPlus

    An advanced MIDI utility for roblox.

    MIDI++ is a utility that allows players to interact with MIDI technology in roblox better, by offering unmatched performance and a ton of features, like MIDI to Qwerty conversion and midi file playback (autoplayer) with track controls and many other features.
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    Downloads: 281 This Week
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  • 18
    GPCS4

    GPCS4

    A work-in-progress PlayStation 4 emulator

    A PlayStation 4 emulator which was just started. A project done for fun, and for technical research. The only reason I have started this project is for learning 3D graphics. It's not intended to become a serious application. Support simple compute shader, compute ring, cube maps. For more details you could join our discord server to contact me, or if you are used to Tencent QQ/TIM, just join our group. There you can get more resources which are useful for contributing. To run or develop GPCS4, a CPU supporting AVX instruction set as well as a graphics card supporting Vulkan 1.3 are required.
    Downloads: 36 This Week
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  • 19
    An open source NES Emulator for Windows and Unix that features solid emulation accuracy and state of the art tools for power users. FCEUX's source code is now hosted at https://github.com/TASVideos/fceux/ win32 autobuilds @ https://ci.appveyor.com/project/zeromus/fceux/build/artifacts
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    Downloads: 190 This Week
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  • 20
    PolyMC

    PolyMC

    Custom launcher to manage multiple installations of Minecraft at once

    An Open Source Minecraft launcher with the ability to manage multiple instances, accounts, and mods. Focused on user freedom and free redistributability. Install and launch modpacks easily, while keeping them clean. No longer do you need to manually install them, and an updating feature is coming soon. PolyMC can do that for you, without installing tons of separate launchers. Are you sick of finding and adding that one mod you need? PolyMC is able to download & update individual mods from outside of mod packs using Modrinth and CurseForge.
    Downloads: 26 This Week
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  • 21
    An open-source emulator for the 3DO Game Console.
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    Downloads: 159 This Week
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  • 22
    DuckStation

    DuckStation

    Fast PlayStation 1 emulator for x86-64/AArch32/AArch64

    DuckStation is an simulator/emulator of the Sony PlayStation(TM) console, focusing on playability, speed, and long-term maintainability. The goal is to be as accurate as possible while maintaining performance suitable for low-end devices. "Hack" options are discouraged, the default configuration should support all playable games with only some of the enhancements having compatibility issues. A "BIOS" ROM image is required to to start the emulator and to play games. You can use an image from any hardware version or region, although mismatching game regions and BIOS regions may have compatibility issues. A ROM image is not provided with the emulator for legal reasons, you should dump this from your own console using Caetla or other means. DuckStation features a fully-featured frontend built using Qt, as well as a fullscreen/TV UI based on Dear ImGui.
    Downloads: 24 This Week
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  • 23
    DOSBox Staging

    DOSBox Staging

    DOSBox Staging is a modern continuation of DOSBox

    DOSBox Staging is a modern continuation of DOSBox, your existing configurations will continue to work, and you will have access to many advanced features. DOSBox Staging picks the best shader based on the emulated video mode and your host resolution, from 720p to 4K.
    Downloads: 23 This Week
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  • 24
    xBRZ

    xBRZ

    xBRZ: "Scale by rules" - high quality image upscaling filter by Zenju

    xBRZ is a high-quality image upscaling filter for creating beautiful HD representations from low-resolution images. Reference implementations for common emulators can be found in the download section: ● DOSBox ● ePSXe ● HqMAME ● ScummVM ● Snes9x ● Kega Fusion http://sourceforge.net/projects/xbrz/files/ Test the xBRZ scaler with your own images and compare against other scalers with the "Scaler Test" tool: http://sourceforge.net/projects/xbrz/files/ScalerTest_1.1.zip
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    Downloads: 166 This Week
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  • 25
    SnapKey

    SnapKey

    SnapKey: Open Source Alternative to Snap Tap & SOCD

    SnapKey is a lightweight, open-source tool that operates from the system tray and is designed to track inputs from the WASD keys, without interfering with any game files. SnapKey's main role is to recognize when these keys are pressed and automatically release any previously engaged commands for them. This guarantees responsive and precise input handling. SnapKey handles the WASD keys by default and lets you rebind them to your liking via the config file. SnapKey: Open Source Alternative to Snap Tap & SOCD Visit SnapKey on GitHub for more information: https://github.com/cafali/SnapKey
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    Downloads: 260 This Week
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