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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.

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

    Build gen AI apps with an all-in-one modern database: MongoDB Atlas

    MongoDB Atlas provides built-in vector search and a flexible document model so developers can build, scale, and run gen AI apps without stitching together multiple databases. From LLM integration to semantic search, Atlas simplifies your AI architecture—and it’s free to get started.
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  • La version gratuite d'Auth0 s'enrichit ! Icon
    La version gratuite d'Auth0 s'enrichit !

    Gratuit pour 25 000 utilisateurs avec intégration Okta illimitée : concentrez-vous sur le développement de vos applications.

    Vous l'avez demandé, nous l'avons fait ! Les versions gratuite et payante d'Auth0 incluent des options qui vous permettent de développer, déployer et faire évoluer vos applications en toute sécurité. Utilisez Auth0 dès maintenant pour découvrir tous ses avantages.
    Essayez Auth0 gratuitement
  • 1
    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: 17,229 This Week
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  • 2
    Doxygen
    Doxygen is a JavaDoc like documentation system for C++, C, Java and IDL.
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    Downloads: 13,769 This Week
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  • 3
    Technical analysis library with indicators like ADX, MACD, RSI, Stochastic, TRIX... includes also candlestick pattern recognition. Useful for trading application developpers using either Excel, .NET, Mono, Java, Perl or C/C++.
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    Downloads: 10,112 This Week
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  • 4
    XHEN MOD+

    XHEN MOD+

    PS3 XHEN-MOD+ v1.4.1

    Modificación de HEN 3.0.3 Contiene: HEN 3.0.3 Oficial -Traducción Español de la sección Red para (Hybrid Firmware Tools ) Herramientas de Firmware Hibrido -Activador de HEN personalizado en español + icono nuevo -Fix para instalar 29 tiendas al mismo tiempo integrado -Tema personalizado moderno que tiene que ser activado luego de instalar el XHEN MOD+ -Logo de inicio personalizado XHEN MOD+ | + Sonidos de PS4 -Imágenes para perfil de usuario personalizados -Contiene varios archivos personalizados extraídos de PS3 4K Pro con animaciones y efectos -Sonido de arranque de PS4 -Sonidos de GameBoot de PS4 -Sonidos de XMB de PS4 -Icono de PS4 Store -XHEN MOD+ Logotipo de Arranque -XHEN MOD+ Logotipo de GameBoot -XHEN MOD+ Textos -PSP Fondos de Onda -PSP Fondos de Colores -Botones Animados de Playstation -Menus Secundarios Animados -Icono de Reloj Animado -Menu de Opciones de Juego Animados -Indicador de Bateria de Color -Soporte 2160p en Salida de Video Y Mas...
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    Downloads: 6,595 This Week
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  • MongoDB Atlas runs apps anywhere Icon
    MongoDB Atlas runs apps anywhere

    Deploy in 115+ regions with the modern database for every enterprise.

    MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
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  • 5
    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: 2,787 This Week
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  • 6
    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: 1,380 This Week
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  • 7
    CoolProp
    A cross-platform, open-source, alternative to NIST REFPROP. Based on reference-accuracy equations of state and transport property correlations for refrigerants like Water, CO2, R134a, Nitrogen, Argon, Ammonia, Air, R404a, R410a, Propane and many others. A selection of secondary working fluid properties are also available. Can also make use of REFPROP when available. In addition, calculations for Humid Air Properties based on ASHRAE RP-1485 are provided. Wrappers are available for MATLAB, Octave, Python, C#, Fortran and many more.
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    Downloads: 1,590 This Week
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  • 8
    Snap7

    Snap7

    32/64 bit multi-platform Ethernet S7 PLC communication suite

    Snap7, through three specialized components: Client and the inedited Server and Partner, allows you to definitively integrate your PC based systems into a PLC automation chain. Designed to transfer large amounts of hi-speed data in industrial facilities, it scales easily, down to small Linux Arm boards such as Raspberry PI. Hi level object oriented wrappers are provided, currently C/C++, .NET/Mono, Pascal, LabVIEW, Python with many source code examples. Very easy to use, a full working server example is not bigger than the “Hello world”. Many projects/makefiles are ready to run to easily rebuild Snap7 in any platform without the need of be a C++ guru. Very detailed documentation provided.
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    Downloads: 847 This Week
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  • 9
    Pidgin IM

    Pidgin IM

    A universal instant messaging (IM) program

    See https://pidgin.im/about/ for more information. Pidgin is an instant messaging program which lets you log in to accounts on multiple chat networks simultaneously. It runs on Windows, Linux, and other UNIX operating systems. Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, MXit, Novell GroupWise Messenger, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. It is written in C and makes heavy use of GLib and GTK+. Finch is a command line instant messaging program. It also lets you log in to accounts on multiple chat network simultaneously, and it is compatible with the same chat networks as Pidgin. It is written in C and makes heavy use of GLib and ncurses.
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    Downloads: 4,248 This Week
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  • The CRM you’ll want to use every day Icon
    The CRM you’ll want to use every day

    With CRM, Sales, and Marketing Automation in one, Act! gives you everything you need for happier clients, more revenue, and less stress.

    Act! Premium is perfect for small and midsize businesses looking to market better, sell more, and create customers for life. With unparalleled flexibility and freedom of choice, Act! Premium accommodates the unique ways you do business. Whether it’s customizations to fit your specific business or industry processes or your preferences for deployment and access, the possibilities with Act! Premium are limitless.
    Learn More
  • 10
    VSCodium

    VSCodium

    binary releases of VS Code without MS branding/telemetry/licensing

    Microsoft’s vscode source code is open source (MIT-licensed), but the product available for download (Visual Studio Code) is licensed under this not-FLOSS license and contains telemetry/tracking. The VSCodium project exists so that you don’t have to download+build from source. This project includes special build scripts that clone Microsoft’s vscode repo, run the build commands, and upload the resulting binaries for you to GitHub releases. These binaries are licensed under the MIT license. Telemetry is disabled. If you want to build from source yourself, head over to Microsoft’s vscode repo and follow their instructions. VSCodium exists to make it easier to get the latest version of MIT-licensed VSCode. Please note that some Visual Studio Code extensions have licenses that restrict their use to the official Visual Studio Code builds and therefore do not work with VSCodium.
    Downloads: 103 This Week
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  • 11
    libusbK

    libusbK

    A complete software solution for windows usb devices

    libusbK is a complete driver/library solution for vendor class usb device interfaces. If you are a usb developer or usb device manufacturer seeking a driver solution for a new USB widget then libusbK could be for you. libusbK encompasses a 100% WinUSB compatible api/funtion set. All WinUSB power/pipe polices are fully supported by the libusbK driver. In Addition, libusbK has full support for isochronous endpoints and an extensive set of additional modules to simplify development. Source code repository using github: https://github.com/mcuee/libusbk
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    Downloads: 666 This Week
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  • 12
    TCP/IP-Network extension for the PLC simulation software Siemens PLCSim (Step 7 V5.4/5.5). With NetToPLCSim you are able to simulate e.g. SCADA systems over Network in combination with your simulated PLC.
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    Downloads: 426 This Week
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  • 13

    Developer's Image Library

    A full featured cross-platform image library

    Developer's Image Library (DevIL) is a cross-platform image library utilizing a simple syntax to load, save, convert, manipulate, filter and display a variety of images with ease.
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    Downloads: 378 This Week
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  • 14
    PNotes
    PNotes is light-weight, flexible, skinnable manager of virtual notes on your desktop. It supports multiple languages, individual note's settings, transparency and scheduling. Absolutely portable as well - no traces in registry. PNotes.NET edition requires .NET framework 4 Client Profile
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    Downloads: 242 This Week
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  • 15
    An open-source emulator for the 3DO Game Console.
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    Downloads: 189 This Week
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  • 16
    Banish crusty code with the Uncrustify C/C++/C#/D/Java/Pawn source code beautifier. It indents, adds newlines, aligns, etc, and is highly configurable.
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    Downloads: 136 This Week
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  • 17
    [OFFICIAL] tinyfiledialogs C C++ v3.21.1

    [OFFICIAL] tinyfiledialogs C C++ v3.21.1

    inputbox password WIN OSX GTK QT Console VCPKG C# Lua R Fortran Pascal

    one C/C++ file & header provides 8 functions: - beep - tray notify popup - message & question - input & password - save file - open file(s) - select folder - color picker complements OpenGL Vulkan GLFW GLUT GLUI VTK SFML TGUI SDL Ogre Unity3d ION OpenCV CeGui MathGL GLM CPW GLOW Open3D ImGui MyGui GLT NGL STB Nuklear Fenster MicroUi & GUI-less programs NO INIT NO MAIN LOOP NO LINKING NO INCLUDE win (XP to 11) ASCII MBCS UTF-8 UTF-16 (wchar_t) - native dialogs osx/unix ASCII UTF-8 - applescript kdialog zenity shanty … ° SSH console / X forwarding / waypipe Wayland ° the dialogs can be forced into console mode ° curses dialogs via Dialog.exe/Dialog (disabled by default) C89/C18 & C++98/C++23 compliant VisualStudio MinGW GCC Clang TinyCC IntelCC OWCC BCC SunCC on Windows Mac Linux Bsd Solaris Minix Raspbian Flatpak Haiku bindings: VCPKG C# R Lua Rust Haskell Java AllegroBasic Fortran Pascal D JavaScript Kotlin click tab 'Files' for prototypes
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    Downloads: 82 This Week
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  • 18
    reacTIVision
    reacTIVision is a computer vision framework for the fast and robust tracking of markers attached on physical objects, and the creation of multi-touch surfaces. It was designed for the rapid development of table-based tangible user interfaces.
    Downloads: 52 This Week
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  • 19
    pngcrush and other tools for manipulating PNG (Portable Network Graphics) and MNG (Multiple-image Network Graphics) files.
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    Downloads: 251 This Week
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  • 20
    Valorant-ESP-tool

    Valorant-ESP-tool

    Highlighting players and items directly in the game.

    ESP for Valorant is a visualization tool designed to provide players with clearer awareness of their surroundings. It highlights the positions of characters and important objects on the map, making gameplay more informative and intuitive. With outlines, markers, and extra details, you can always track where opponents or teammates are, helping you react faster and make better decisions in each round. (valorant esp hack, hacks valorant, val hack, valorant esp, esp valorant, valorant esp hack, valorant hack esp, wall esp valorant, esp cheat valorant, valorant, xit valorant, valorant hack, hack valorant, best valorant hack, valorant cheat, cheat valorant, valorant hacks, hacks valorant, best valorant cheat, best valorant hacks, valorant aimbot, valorant hacker, valorant cheats, valorant hack pc, aimbot valorant, cheats valorant, valorant banned, best valorant player, best valorant cheats, valorant mod 2025, cheat valorant pc, aim tool valorant, free mod valorant)
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    Downloads: 85 This Week
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  • 21
    FOG - A Free Cloning Solution
    FOG is a free open-source cloning/imaging solution/rescue suite. FOG can be used to image Windows XP, Vista, Windows 7 and Window 8 PCs using PXE, PartClone, and a Web GUI to tie it together. Includes featues like memory and disk test, disk wipe, av scan & task scheduling.
    Downloads: 34 This Week
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  • 22
    Importer library to import assets from different common 3D file formats such as Collada, Blend, Obj, X, 3DS, LWO, MD5, MD2, MD3, MDL, MS3D and a lot of other formats. The data is stored in an own in-memory data-format, which can be easily processed. www.open3mod.com/ is a 3D model viewer and exporter based on Assimp that is also Open Source.
    Downloads: 35 This Week
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  • 23
    SQLite.org took over this project in 2010
    Downloads: 32 This Week
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  • 24
    Snarl

    Snarl

    Stuff Happens - know about it.

    Snarl displays short bursts of information on screen in the form of small, beautiful, pop-ups that fade in and out. However, it's much more than just that: connect applications and external sources into Snarl to provide a rich array of notifications in a single place, then create rules to forward these notifications to your mobile devices, email inbox - or even friends, family, or a workforce.
    Downloads: 46 This Week
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  • 25

    Tiny Multi Bootloader+

    Serial Bootloader for Microchip, Atmel, NXP, TI, 8051 microcontrolers

    What is it? It's a Bootloader for Microchip, Atmel, NXP, TI and 8051 devices. A Bootloader is a firmware running in the microcontroler device which allows the user to send it's own firmware without the need of a programmer. This Bootloader consists of: - firmwares for many devices (this firmware need to be send to the device's flash memory with a programmer, only once) - a PC software which communicates with the bootloader firmware in the device and send the user's program in its memory Where does it come from? This Bootloader is based on "Tiny PIC Bootloader" made by Claudiu Chiculita. A special THANK to him!!! What can it do? It can program: - Microchip PIC10/12/16/18/24/32/dsPIC30/33 - Atmel ATtiny, ATmega - TI MPS430 - NXP ARM Cortex-M0+ - Silicon Labs C8051 And this: - with light modifications to the Bootloader firmware for new devices - without modifying your source code or using a special linker script - via GUI or command line prog - with automatic Reset
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    Downloads: 48 This Week
    Last Update:
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