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

  • Save Up to 91% on Cloud Compute With Spot VMs Icon
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  • Ship Agents Faster Icon
    Ship Agents Faster

    Transform your applications and workflows into powerful agentic systems at global scale.

    Gemini Enterprise Agent Platform lets you rapidly build, scale, govern and optimize production-ready agents grounded in your organization's data. The platform enables developers to build custom or pre-built agents for virtually any use case. New customers get $300 in free credits.
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  • 1
    AutoClicker

    AutoClicker

    A full-fledged autoclicker with two modes of autoclicking

    A full-fledged autoclicker with two modes of autoclicking, at your dynamic cursor location or at a prespecified location. The maximum amounts of clicked can also be set (or left as infinite). Hotkeys work in the background for convenience. If you need to automate multiple mouse clicks, try this multiple auto clicker: https://sourceforge.net/projects/orphamielautoclicker/files/AutoClickers.exe/download Whats new in v1.0.0.2: 1. You can now change your hotkeys! 2. Changed the about page 3. Added a few minor options v1.0.0.1 : 1. Your settings are now saved from your last session so you only need to enter them once. (Includes last fixed location) 2. Added double clicking and triple clicking 3. Added Right clicking and middle clicking
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    Downloads: 759,379 This Week
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  • 2
    KeePass

    KeePass

    A lightweight and easy-to-use password manager

    KeePass Password Safe is a free, open source, lightweight, and easy-to-use password manager for Windows, Linux and Mac OS X, with ports for Android, iPhone/iPad and other mobile devices. With so many passwords to remember and the need to vary passwords to protect your valuable data, it’s nice to have KeePass to manage your passwords in a secure way. KeePass puts all your passwords in a highly encrypted database and locks them with one master key or a key file. As a result, you only have to remember one single master password or select the key file to unlock the whole database. And the databases are encrypted using the best and most secure encryption algorithms currently known, AES and Twofish. See our features page for details.
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    Downloads: 204,216 This Week
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  • 3
    Safe Exam Browser
    Safe Exam Browser is a webbrowser-environment to carry out online-exams safely. The software changes any computer into a secure workstation. It regulates the access to any utilities and prevents students from using unauthorised resources.
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    Downloads: 251,570 This Week
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  • 4
    Winhance

    Winhance

    Application designed to optimize and enhance your Windows experience

    Winhance is a Windows enhancement utility designed to debloat, optimize, and customize Windows 10 and 11 systems. Built as a C# application, it provides a user-friendly interface that allows users to manage apps, adjust system settings, and apply performance improvements without requiring a fresh OS installation. Winhance includes tools for removing unwanted Windows apps, installing third-party software via WinGet, and configuring privacy, update, and power settings. It also offers customization options for themes, taskbar layout, Start menu behavior, and File Explorer preferences. Advanced tools allow users to create custom Windows ISOs and generate autounattend.xml files based on their chosen configurations. Designed for individuals and IT professionals alike, Winhance delivers a comprehensive, all-in-one solution for enhancing and personalizing the Windows experience.
    Downloads: 7,176 This Week
    Last Update:
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  • Build Securely on AWS with Proven Frameworks Icon
    Build Securely on AWS with Proven Frameworks

    Lay a foundation for success with Tested Reference Architectures developed by Fortinet’s experts. Learn more in this white paper.

    Moving to the cloud brings new challenges. How can you manage a larger attack surface while ensuring great network performance? Turn to Fortinet’s Tested Reference Architectures, blueprints for designing and securing cloud environments built by cybersecurity experts. Learn more and explore use cases in this white paper.
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  • 5
    Doxygen
    Doxygen is a JavaDoc like documentation system for C++, C, Java and IDL.
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    Downloads: 16,189 This Week
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  • 6
    TGM Gaming Macro

    TGM Gaming Macro

    Lets you have a macro mouse n keyboard functionally with ordinary one.

    Official TGMacro Websites: 🌐 https://trksyln.net/projects/TGM-Gaming-Macro-(TGMacro)-4 🌐 https://gettgmacro.com Looking for old version? 🌐 https://trksyln.net/projects/TGM-Gaming-Macro-(TGMacro)-4/#download ⚡ TGMacro turns any ordinary mouse and keyboard into powerful macro devices. Easily create or record multiple macros, assign each to different keys or key combinations, and trigger or loop them whenever you need—whether it’s rapid-fire actions in games, complex multi-step workflows, or simple shortcuts that save you time every day. 🎮 Designed for gamers, but versatile enough for everyday tasks—TGMacro gives you full control and flexibility. 💡 Questions, bug reports, or feature requests? Older versions: https://trksyln.net/contact Current version: https://gettgmacro.com/contact Discord channel: https://discord.gg/gJ5ZNt4AAW https://gettgmacro.com/GetStarted
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    Downloads: 20,981 This Week
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  • 7
    Process Hacker

    Process Hacker

    View and manage processes, services and more with this powerful tool.

    Process Hacker is a free and open source process viewer. This multi-purpose tool will assist you with debugging, malware detection and system monitoring.
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    Downloads: 15,021 This Week
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  • 8
    Bulk Crap Uninstaller

    Bulk Crap Uninstaller

    Remove large amounts of unwanted applications quickly.

    Bulk Crap Uninstaller (in short BCUninstaller or BCU) is a free (as in speech and beer) bulk program uninstaller with advanced automation. It excels at removing large amounts of applications with minimal to no user input, while requiring next to no technical knowledge. It can detect most applications and games (even portable or not registered), clean up leftovers, force uninstall, automatically uninstall according to premade lists, and much more. Bulk Crap Uninstaller is licensed under Apache 2.0 open source license, and can be used in both private and commercial settings for free and with no obligations, as long as no conditions of the license are broken.
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    Downloads: 13,082 This Week
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  • 9
    Turbo C++

    Turbo C++

    Turbo C++ for Latest Edition of Windows

    TurboCPP is a repository that presents a version of the classic Turbo C++ IDE made compatible with modern Windows editions (Windows 8, 10, 11). Essentially, it revives a legacy development environment that many students or enthusiasts still prefer for simplicity or nostalgia, packaged for current systems. The repository includes installer or distribution artifacts, compatibility wrappers, and sometimes tweaks to make it work under modern OS constraints. It allows users to run and compile old Turbo C++ programs without needing legacy virtual machines or DOS emulators. While it does not match modern compilers in standards compliance, optimization, or language features, its attraction lies in compatibility with educational or legacy codebases. The project targets hobbyists or learners who want to revisit old C++ assignments or retro programming without abandoning newer system environments.
    Downloads: 2,443 This Week
    Last Update:
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  • Veeam Data Platform v13.1 - Get Your Free Trial Icon
    Veeam Data Platform v13.1 - Get Your Free Trial

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  • 10
    ODM

    ODM

    Device Manager for ONVIF-based Network video devices.

    ODM is a ONVIF protocol implementation of Network Video Client (NVC) to manage Network Video Transmitters (NVT), Network Video Storage (NVS) and Network Video Analytics (NVA) devices. Implements Discovery, Device, Media, Imaging, Analytics, Events and PTZ services. Write in C# and uses ffmpeg for media decoding.
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    Downloads: 7,039 This Week
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  • 11
    Clipper

    Clipper

    Polygon and line clipping and offsetting library (C++, C#, Delphi)

    This library is now obsolete and no longer being maintained. It has been superceded by my Clipper2 library - https://github.com/AngusJohnson/Clipper2.
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    Downloads: 5,970 This Week
    Last Update:
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  • 12
    x360ce (Xbox 360 Controller Emulator)

    x360ce (Xbox 360 Controller Emulator)

    x360ce allows your controller to function as an Xbox 360 controller

    x360ce, or Xbox 360 Controller Emulator, is a Windows utility that lets many gamepads, joysticks, wheels, and other controllers behave like an Xbox 360 controller. It is mainly used for PC games that support XInput controllers but do not properly recognize older or non-Xbox DirectInput devices. Older versions worked by placing configuration and DLL files inside a game folder, while version 4 uses a virtual Xbox 360 controller driver while the app keeps running. The project includes the emulator application, supporting libraries, front-end tools, configuration logic, and controller mapping features. It can help users map buttons, triggers, sticks, POV inputs, and wheel controls to the layout expected by games. x360ce is useful for players who want broader controller compatibility without replacing their existing hardware.
    Downloads: 1,242 This Week
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  • 13
    Eraser

    Eraser

    A security tool to remove sensitive data from your Windows hard drive

    Eraser is a secure data removal tool for Windows. It completely removes sensitive data from your hard drive by overwriting it several times with carefully selected patterns.
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    Downloads: 7,306 This Week
    Last Update:
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  • 14
    Technical analysis library with indicators like ADX, MACD, RSI, Stochastic and TRIX, plus candlestick pattern recognition. Docs: https://ta-lib.org Available natively in C/C++, Java, Rust and C# with wrappers for python, R and many other ecosystems. MOVED TO GITHUB: https://github.com/TA-Lib/ta-lib . No further support is provided on SourceForge. Release 0.4.0 is very outdated, please check github for the most recent release.
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    Downloads: 6,597 This Week
    Last Update:
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  • 15
    dnSpy

    dnSpy

    .NET debugger and assembly editor

    dnSpy is a free and open-source tool tailored for debugging, decompiling, and editing .NET and Unity assemblies—even without source code. It supports light/dark themes and portable use, making it popular among developers and reverse engineers.
    Downloads: 1,013 This Week
    Last Update:
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  • 16
    v2rayN

    v2rayN

    A V2Ray GUI client for Windows, Linux and macOS

    A V2Ray client for Windows, Linux and macOS, supports Xray core and v2fly core. If you are new to this, please download v2rayN-Core.zip from releases. Otherwise please download v2rayN.zip (you will also need to download v2ray core into the same folder with v2rayN.exe) Run v2rayN.exe.
    Downloads: 1,001 This Week
    Last Update:
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  • 17
    FreeImage is a library project for developers who would like to support popular graphics image formats (PNG, JPEG, TIFF, BMP and others). Some highlights are: extremely simple in use, not limited to the local PC (unique FreeImageIO) and Plugin driven!
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    Downloads: 4,412 This Week
    Last Update:
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  • 18
    AssetStudio

    AssetStudio

    AssetStudio is a tool for exploring, extracting and exporting assets

    AssetStudio is a cross-platform tool for exploring, extracting, and exporting assets from Unity games—supporting assetbundles and built-in assets. It handles textures, sprites, audio, meshes, shaders, and more, exporting to formats like png, bmp, mp3, wav. The original is archived (supports Unity ≤2022.1); forks like AssetStudio2024 add support for newer Unity versions and Lua asset decompiling.
    Downloads: 917 This Week
    Last Update:
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  • 19
    Firebird

    Firebird

    A powerful, cross platform, SQL database system

    Firebird RDBMS offers ANSI SQL features & runs on Linux, Windows & several Unix platforms. Features excellent concurrency & performance & powerful stored procedure & trigger language. More information and downloads at https://firebirdsql.org/, issue tracker is https://github.com/FirebirdSQL/firebird/issues
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    Downloads: 3,537 This Week
    Last Update:
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  • 20
    Dual Monitor Tools

    Dual Monitor Tools

    Tools for Windows users with dual or multiple monitors.

    Tools for Windows users with dual or multiple monitors. Has hotkeys for moving windows around, restrict mouse/cursor movement between screens, application launcher, wallpaper creator and changer and a screen capture tool.
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    Downloads: 3,619 This Week
    Last Update:
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  • 21
    PatchCleaner

    PatchCleaner

    Windows Installer Directory Cleaner

    Cleans your windows Installer directory of orphaned and redundant installation (.msi) and patch (.msp) files
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    Downloads: 6,529 This Week
    Last Update:
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  • 22
    Proton VPN Windows App

    Proton VPN Windows App

    Official ProtonVPN Windows app

    The ProtonVPN Windows app project hosts the official open-source client software that lets users securely connect their Windows machines to the ProtonVPN service with full system-wide VPN protection. It includes a modern GUI built with .NET and WPF that lets users authenticate, choose VPN servers, and configure features like split tunneling or kill switch, while a background Windows service manages VPN connections using the OpenVPN protocol and handles networking tasks such as firewall and adapter configuration. The app integrates a custom TAP driver and a split tunnel callout driver to help route traffic securely and prevent leaks, and is structured so the GUI and service components work together to deliver a smooth user experience on Windows desktops and laptops. ProtonVPN’s Windows client supports both free and paid users with access to Proton’s global server network, encrypted tunnels, and privacy-first policies that block logging and respect user anonymity.
    Downloads: 806 This Week
    Last Update:
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  • 23
    Open Hardware Monitor

    Open Hardware Monitor

    Monitor temperature sensors, fan speeds, voltages, load & clock speeds

    Open Hardware Monitor is a free and open-source hardware monitoring tool that helps users track the health and performance of their computer. It monitors key system metrics such as CPU temperatures, fan speeds, voltages, clock speeds, and system load. The software supports many hardware monitoring chips commonly found on modern motherboards. It can also read Intel and AMD processor temperature sensors, GPU sensors from ATI and Nvidia cards, and SMART hard drive temperatures. Users can view monitored values in the main window, system tray, or a customizable desktop gadget. Open Hardware Monitor runs on 32-bit and 64-bit Windows systems as well as x86-based Linux operating systems without requiring installation.
    Downloads: 754 This Week
    Last Update:
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  • 24
    gPhoto
    gPhoto is a program and library framework that lets users download pictures from their digital cameras. The libgphoto2 library gives you access to hundreds of models of digital cameras on several platforms. GIT repo and Issue tracker lives at https://github.com/gphoto/ these days.
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    Downloads: 3,335 This Week
    Last Update:
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  • 25
    PowerShell

    PowerShell

    Command-line shell and scripting language built on .NET

    Powershell is a cross-platform, task-based command-line shell and scripting language that helps rapidly automate tasks that manage operating systems (Linux, macOS and Windows) and processes. It works well with existing tools and is optimized for dealing with structured data, REST APIs and object models. PowerShell was developed by Microsoft as a task management and configuration management framework. Powershell is designed to let you manage computers from the command line and improve the command-line and scripting environment.
    Downloads: 681 This Week
    Last Update:
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