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

  • One Platform. Total IT Insight. Start with PRTG Now Icon
    One Platform. Total IT Insight. Start with PRTG Now

    Rely on a single source of truth. PRTG unifies monitoring for all your systems, apps, and services.

    Why settle for fragmented monitoring? PRTG consolidates everything - servers, VMs, network devices, cloud services, and more, into one powerful platform. Get real-time status, customizable alerts, and deep analytics to drive smarter decisions. Designed for complex environments, PRTG scales with your needs, supports team collaboration, and helps you prevent outages before they impact users. Take control of your IT landscape and deliver the uptime your business requires.
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  • Turn speech into text using Google AI Icon
    Turn speech into text using Google AI

    Accurately convert voice to text in over 125 languages and variants by applying powerful machine learning models with an easy-to-use API.

    New customers get $300 in free credits to spend on Speech-to-Text. All customers get 60 minutes for transcribing and analyzing audio free per month, not charged against your credits.
    Try for free
  • 1
    99 Nights in The Forest Script NO KEY

    99 Nights in The Forest Script NO KEY

    99 Nights in the Forest Script - Bring All, Auto Win, Auto Kill.

    🛠️Download Free Scripts for 99 Nights in the Forest featuring ESP, Aimbot, Auto Tree Farm, Flying, and Instant Teleporting to all major items and enemies. Built with Rayfield UI. Perfect for farming, looting, and survival. Best Executor : https://sourceforge.net/projects/roblox-executor-wave/ ⚠️ Disclaimer Using scripts in Roblox can result in bans. Use at your own risk. 99 Nights in the Forest script no key, 99 Nights in the Forest codes,
    Downloads: 9,502 This Week
    Last Update:
    See Project
  • 2
    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: 67 This Week
    Last Update:
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  • 3
    99 Nights In The Forest Script / No Key

    99 Nights In The Forest Script / No Key

    99 Nights Script Keyless: Auto Farm, Kill Aura, Teleport + more

    Download the New Best Keyless Script for 99 Nights in The Forest Roblox — No Key System, Safe, and Updated for 2025! This script is completely keyless, providing a seamless and secure gaming experience. It has been updated for 2025, bringing improved features and better performance, making your gameplay smoother and more enjoyable. We’ve tested the script with Xeno Executor, and it works flawlessly. To make things even easier, we've included an injector that's perfectly compatible with it, specifically Xeno. Best of all, since this script doesn’t require a key, you can enjoy it without any hassle. Xeno : https://sourceforge.net/projects/xeno-executor-roblox/ PC requirements : Operating System: Windows 10 (64-bit) or Windows 11 Processor: Intel Core i3-2120 or equivalent Graphics: DirectX 10 compa Memory: 4 GB RAM Storage: At least 1 GB of free space Internet: 4–8 Mbit/s recommended Supported Browsers: Chrome, Firefox, Microsoft Edge
    Downloads: 838 This Week
    Last Update:
    See Project
  • 4
    99 Nights In The Forest Script / Keyless

    99 Nights In The Forest Script / Keyless

    99 Nights Script No Key: Kill Aura, Auto Combat, Auto Craft, & other

    Download 99 Nights In The Forest Script | Keyless for free. 99 Nights Script Keyless : Kill Aura, Auto Farm, Auto Craft, & other. Transform into any creature, fly or noclip freely, see clearly with fullbright, teleport instantly, move faster with infinite jump, auto-gather and refill resources, and dominate battles with built-in killaura, defense boosts, and more.
    Downloads: 344 This Week
    Last Update:
    See Project
  • Deliver trusted data with dbt Icon
    Deliver trusted data with dbt

    dbt Labs empowers data teams to build reliable, governed data pipelines—accelerating analytics and AI initiatives with speed and confidence.

    Data teams use dbt to codify business logic and make it accessible to the entire organization—for use in reporting, ML modeling, and operational workflows.
    Learn More
  • 5
    RetroArch

    RetroArch

    RetroArch is a frontend for emulators, game engines and media players.

    RetroArch is a way to run classic games on a wide assortment of Operating Systems and Consoles. Support the Developers on their Patron! https://www.patreon.com/libretro
    Downloads: 19 This Week
    Last Update:
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  • 6
    MAME4droid

    MAME4droid

    MAME Android Emulator.

    MAME4droid (0.139u1) is developed by David Valdeita (Seleuco), port of MAME 0.139u1 emulator by Nicola Salmoria and TEAM. MAME4droid (0.139u1) emulates arcade games supported by original MAME 0.139u1. This MAME4droid version is targeted to Dual-Core devices, because it is based on a high specs 2010 PC MAME build. Anyway don't expect arcade games of the 90 to work at full speed. With some games that are really bad optimized (like outrun or mk series) you will need at least a 1.5 ghz dual-core device (Cortex A15). This is related to MAME build used, since it is targeted to high specs PC's as i said before. This version emulates over 8000 different romsets. Please, try to understand that that with that amount of games, some will run better than others and some might not even run with MAME4droid. Please, don't email me asking for a specific game to run. Official web page for news, source code & additional information: http://code.google.com/p/imame4all/
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    Downloads: 77 This Week
    Last Update:
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  • 7
    TinTin++ Mud Client

    TinTin++ Mud Client

    A MUD client for Android, iOS, Linux, Mac OS X and Windows

    TinTin++ is a console mud client for any type of text mud or bbs. The mud client's main assets are an easy to learn scripting language, triggers, automapping, and a split screen interface to separate mud output from client input. Installation instructions for Android, iOS, and several other operating systems are available on the website. https://tintin.mudhalla.net
    Downloads: 26 This Week
    Last Update:
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  • 8
    Nesoid

    Nesoid

    NES emulator for Android phones

    This project is based on sources, published by original Nesoid developer, who in turn used code of GPFCE, forked from FCEUltra, currently incarnation of which is known as FCEUX. Help and suggestions are welcome. This project has been abandoned in favor of the RetroArch, another awesome free software emulator (which has much better NES support and is more actively developed): http://www.libretro.com/.
    Downloads: 17 This Week
    Last Update:
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  • 9
    Neko Project II for Android

    Neko Project II for Android

    PC-98 emulator for Android phones

    This project is based on sources, published by someone with nickname sawada, who used code of Neko Project II. Help and suggestions are welcome.
    Leader badge">
    Downloads: 37 This Week
    Last Update:
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  • Easy-to-Use Website Accessibility Widget Icon
    Easy-to-Use Website Accessibility Widget

    An accessibility solution for quick website accessibility improvement.

    All in One Accessibility is an AI based accessibility tool that helps organizations to enhance the accessibility and usability of websites quickly.
    Learn More
  • 10
    GameBoid

    GameBoid

    Gameboy Advance emulator for Android phones

    This project is based on sources published by original GameBoid developer, who in turn used code of gpSP2X, based on gpSP. Help and suggestions are welcome. This project is abandoned in favor of RetroArch: http://www.libretro.com/. Seriously, check that one out!
    Downloads: 28 This Week
    Last Update:
    See Project
  • 11
    Asphyre

    Asphyre

    Asphyre is a cross-platform framework for Delphi and FreePascal.

    Asphyre, also known as Platform eXtended Library, is a cross-platform framework for developing video games and scientific applications in Delphi, and FreePascal/Lazarus. The framework provides facilities for real-time rendering of graphics (using DirectX, OpenGL or Software Renderer), text output, mathematics (including vectors and matrices) and networking communication, among other features. It also supports singleboard devices such as Raspberry PI, Intel Galileo, BeagleBone Black and others with features like GPIO, SPI, I2C and so on, along with external displays, sensors and other peripheral devices.
    Leader badge">
    Downloads: 11 This Week
    Last Update:
    See Project
  • 12
    GBCoid

    GBCoid

    Gameboy and Gameboy Color emulator for Android phones

    This project is based on sources published by original GBCoid developer, who in turn used code of gnuboy. Help and suggestions are welcome. This project has been abandoned in favor of RetroArch, another awesome free software console emulator (which is also actively developed): http://www.libretro.com/.
    Leader badge">
    Downloads: 3 This Week
    Last Update:
    See Project
  • 13
    aScanmem

    aScanmem

    game cheater for Android

    aScanmem is Android frontend for scanmem game hacking utility. Scanmem is a Linux cheating tool acting also as debugger / memory editor with support for viewing memory regions watching and repeatedly setting values in chosen address space.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 14
    MMORpgmaker
    A MMORPG Game Engine Writted in Monogame GL full C# Very easy to make a game. With simple Level Editor. Whit cross-plattform Server on .NET Core Tecnology Build your Cross-Platform Game whitout programming! Aviable for Xbox one, PS4, Android, iOS and more platform. Try Live Demo: http://www.makingitalia.net/MireWEB/ Project are migrated on Mire Engine. See Updated at: http://www.makingitalia.net/mire/
    Downloads: 1 This Week
    Last Update:
    See Project
  • 15
    ZED OS

    ZED OS

    ZED OS the clone of Windows XP

    ZED OS is a portuguese Linux based distribution (remaster of Ubuntu Mate). It was designed for users who want an innovative system. With both 3D and 2D interfaces you'll be able to chosse the better one according to your hardware/needs. It's Web Based and inspired in Windows XP from Microsoft
    Downloads: 2 This Week
    Last Update:
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  • 16
    Ataroid

    Ataroid

    Atari emulator for Android phones

    This project is based on sources published by original Ataroid developer, who in turn used code of Stella. This project is abandoned in favor of Droid2600: https://code.google.com/p/droid2600/. Available sources do not compile into anything working anyway.
    Downloads: 0 This Week
    Last Update:
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  • 17

    Pokemon ROMS

    Modified Pokemon games for emulators or devices.

    Pokemon ROMs are modified versions of Pokemon video games that can be played on emulators or compatible devices. These ROMs enable players to enjoy classic Pokemon titles with added features or enhancements, often created by fans. However, it's crucial to acknowledge that downloading and using Pokemon ROMs without owning the original game cartridge may infringe on copyright laws, so users should be aware of the legal implications associated with their use.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    Urho3D

    Urho3D

    Urho3D Game engine

    Urho3D is a game engine made by developers, for developers. The code is clean and well-commented. Urho3D is free and will always be free. There is no hidden royalties. It is IDE-agnostic and has no vendor lock-in. Urho3D runs on Windows, Linux, macOS/iOS/tvOS, Android, and even on Raspberry Pi. It also runs on your browsers. You need an installed Urho3D library for the desired target platform to proceed. Although the Urho3D build system also supports linking the Urho3D library directly from its build tree, this quick start section will not be discussing it here. Assuming you have been following along from the previous section, execute the following commands to create a new UrhoApp project, and then build it. The build artifacts from DBE can be found in the usual location as the conventional (non-dockerized) build environment. In fact the build artifacts from DBE should function and work as if they are built using the conventional way too.
    Downloads: 0 This Week
    Last Update:
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