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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.

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  • Context for your AI agents Icon
    Context for your AI agents

    Crawl websites, sync to vector databases, and power RAG applications. Pre-built integrations for LLM pipelines and AI assistants.

    Build data pipelines that feed your AI models and agents without managing infrastructure. Crawl any website, transform content, and push directly to your preferred vector store. Use 10,000+ tools for RAG applications, AI assistants, and real-time knowledge bases. Monitor site changes, trigger workflows on new data, and keep your AIs fed with fresh, structured information. Cloud-native, API-first, and free to start until you need to scale.
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  • 1
    DWSIM - Open Source Process Simulator

    DWSIM - Open Source Process Simulator

    Simulate chemical processes using advanced thermodynamic models

    DWSIM is an open source, CAPE-OPEN compliant chemical process simulator for Windows, Linux and macOS systems. Written in VB.NET and C#, DWSIM features a comprehensive set of unit operations, advanced thermodynamic models, support for reacting systems, petroleum characterization tools and a fully-featured graphical interface. DWSIM Pro is a commercial sibling of DWSIM built on top of open-source software. It offers extended features, comes with private support, and is accessible in the cloud. Visit simulate365.com for details.
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    Downloads: 1,876 This Week
    Last Update:
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  • 2
    QTTabBar is extension for Windows Explorer that brings tabbed browsing to Microsoft's file browser, along with a host of other great features. Under new management! Now in public beta!
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    Downloads: 291 This Week
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  • 3
    OpenTabletDriver

    OpenTabletDriver

    Open source, cross-platform, user-mode tablet driver

    OpenTabletDriver is an open-source, cross-platform, user mode tablet driver. The goal of OpenTabletDriver is to be cross-platform as possible with the highest compatibility in an easily configurable graphical user interface. OpenTabletDriver functions as two separate processes that interact with each other seamlessly. The active program that does all of the tablet data handling is OpenTabletDriver.Daemon. The daemon must be started in order for anything to work, however, the GUI is unnecessary. If you have existing settings, they should apply when the daemon starts. The requirements to build OpenTabletDriver are consistent across all platforms. Running OpenTabletDriver on each platform requires different dependencies. Run build.ps1 to produce binary builds to 'bin' folder. These builds will run in portable mode by default.
    Downloads: 69 This Week
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  • 4
    VGMToolbox is a C# based tool to assist VGM collectors and dumpers. It includes tools to extract, optimize, and build VGM formats as well as auditing and exploration utilities. [GBS, KSS, MDX, NSF(E), SID, S98, SPC, VGM, XA, XMA, xSF (PSF/PSF2/etc)]
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    Downloads: 444 This Week
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  • Smart Business Texting that Generates Pipeline Icon
    Smart Business Texting that Generates Pipeline

    Create and convert pipeline at scale through industry leading SMS campaigns, automation, and conversation management.

    TextUs is the leading text messaging service provider for businesses that want to engage in real-time conversations with customers, leads, employees and candidates. Text messaging is one of the most engaging ways to communicate with customers, candidates, employees and leads. 1:1, two-way messaging encourages response and engagement. Text messages help teams get 10x the response rate over phone and email. Business text messaging has become a more viable form of communication than traditional mediums. The TextUs user experience is intentionally designed to resemble the familiar SMS inbox, allowing users to easily manage contacts, conversations, and campaigns. Work right from your desktop with the TextUs web app or use the Chrome extension alongside your ATS or CRM. Leverage the mobile app for on-the-go sending and responding.
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  • 5
    Universal x86 Tuning Utility

    Universal x86 Tuning Utility

    Unlock the full potential of your Intel/AMD based device

    Unlock the full potential of your Intel/AMD-based device.
    Downloads: 61 This Week
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  • 6
    MPos - Mouse Position

    MPos - Mouse Position

    Mouse coordinates and DPI information for Windows 10

    MPos is a minimalistic and easy to use tool to track the current position of the cursor on the screen. MPos especially considers High-DPI monitors and DPI scaling of Windows 10. The mouse position is provided in physical/ unscaled Windows pixels and in coordinates scaled by DPI-virtualization. The tool also provides information about the DPI scaling and the raw/ physical DPI of the current monitor. Note: MPos requires Windows 8.1 or newer and .NET Framework v.4.6 or newer. Get support: https://github.com/bluegrams/MPos/issues Support the development: https://ko-fi.com/alxnull
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    Downloads: 374 This Week
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  • 7
    ArchiSteamFarm

    ArchiSteamFarm

    C# application with primary purpose of farming Steam cards

    ASF is a C# application with the primary purpose of farming Steam cards from multiple accounts simultaneously. Unlike Idle Master which works only for one account at a given time, while requiring Steam client running in the background and launching additional processes imitating "game-playing" status, ASF doesn't require any Steam client running in the background, doesn't launch any additional processes and is made to handle unlimited Steam accounts at once. In addition to that, it's meant to be run on servers or other desktop-less machines and features full cross-OS support, which makes it possible to launch on any operating system with .NET Core runtime, such as Windows, Linux, and macOS. ASF is possible thanks to the gigantic amount of work done in the marvelous SteamKit2 library. Today, ASF is one of the most versatile Steam power tools, allowing you to make use of many features that were implemented over time.
    Downloads: 58 This Week
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  • 8
    MonoGame

    MonoGame

    One framework for creating powerful cross-platform games

    One framework for creating powerful cross-platform games. The spiritual successor to XNA with thousands of titles shipped across desktop, mobile, and console platforms. MonoGame is a fully managed .NET open source game framework without any black boxes. Create, develop and distribute your games your way. By leveraging C# and other .NET languages on Microsoft and Mono platforms you can write modern, fast, and reliable game code. We currently support iOS, Android, MacOS, Linux, all Windows platforms, PS4, PSVita, Xbox One, and Switch with more platforms on the way. All the code is available to you ensuring you'll have the ability to make changes when you need to or even port to whole new platforms. With 1000s of shipped games we have built up a vibrant community of developers which use MonoGame for both fun and profit.
    Downloads: 57 This Week
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  • 9
    YoutubeDownloader

    YoutubeDownloader

    Downloads videos and playlists from YouTube

    YoutubeDownloader is a cross-platform GUI application built with C#, using YoutubeExplode to fetch videos, playlists, or channel content from YouTube. It supports keyword search, batch download, format selection, vigilant mode, and FFmpeg integration. Available for Windows, Linux, and macOS (portable binaries included). It’s actively maintained and open-source under GPL‑3.0+.
    Downloads: 57 This Week
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  • 10
    smtp4dev

    smtp4dev

    The fake smtp email server for development and testing

    smtp4dev - the fake SMTP email server for development and testing. A dummy SMTP server for Windows, Linux, Mac OS-X (and maybe elsewhere where .NET Core is available). Lets you test your application without spamming your real customers.
    Downloads: 57 This Week
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  • 11
    Chocolatey

    Chocolatey

    Chocolatey - the package manager for Windows

    Chocolatey has the largest online registry of Windows packages. Chocolatey packages encapsulate everything required to manage a particular piece of software into one deployment artifact by wrapping installers, executables, zips, and/or scripts into a compiled package file. Package submissions go through a rigorous moderation review process, including automatic virus scanning. The community repository has a strict policy on malicious and pirated software. Many organizations face the ongoing challenge of deploying and supporting various versions of software. Chocolatey allows organizations to automate and simplify the management of their complex Windows environments. Our customers have experienced a massive reduction in effort, improved speed of deployment, high reliability, and comprehensive reporting. Whether you are looking to create your first package or planning to fully automate your entire Windows Lifecycle. Its time to step out of the dark ages and stop doing things manually.
    Downloads: 56 This Week
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  • 12
    Files

    Files

    A modern file manager for Windows

    A modern file explorer that pushes the boundaries of the platform. Explore a beautiful Windows-first design. Manage all your files with increased productivity. Work across multiple folders with tabs. And so much more. Cloud files integration? Tabs and multiple layouts? Rich file previews? Files has it covered with robust features you expect from a modern file manager. Have it your way. Files features a fully customizable user interface, right down to the colors and materials. Try custom themes that are built into Files or dive right into the docs and create your own. Files is free and open source software, maintained and designed by a collective of hundreds of contributors. Integration with cloud services such as OneDrive, Google Drive, and iCloud allow you to manage your documents and photos in the cloud, right from the sidebar.
    Downloads: 56 This Week
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  • 13

    NppMenuSearch

    Search Notepad++ menu items and preference settings

    Plugin development moved to GitHub: https://github.com/peter-frentrup/NppMenuSearch. Binaries continue to be served here. Notepad++ Menu Search Plugin This plugin adds a text field to the toolbar for searching menu items and preference dialog options. The plugin is inspired by a similar Visual Studio 2012 functionality. It is written in C# using the approach described in http://sourceforge.net/projects/notepad-plus/forums/forum/482781/topic/4404278
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    Downloads: 304 This Week
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  • 14
    MouseController

    MouseController

    Records and plays back mouse actions

    MouseController lets you record and save mouse movement and clicks with a push of a key. Shortcut keys for record and playback are configurable (function keys only). Playback can be delayed and repeated infinitely at a configurable interval. A time stretch function lets you slow down or speed up the playback. Execution via command line provides the option to set most parameters visible in the UI. This application requires the .NET Framework 4.8 runtime. The installer will attempt to install the framework if necessary.
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    Downloads: 349 This Week
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  • 15
    Git Extensions

    Git Extensions

    Git Extensions is a standalone UI tool for managing git repositories.

    Git Extensions is now hosted on GitHub ============================== Please update your bookmarks and use the links below for downloading and reporting issues. * Download latest version (Windows only): https://github.com/gitextensions/gitextensions/releases/latest * Download latest cross-platform version (Windows and Linux/Mac): https://github.com/gitextensions/gitextensions/releases/v2.51.05 * Issue tracker: http://github.com/gitextensions/gitextensions/issues * Source code: http://github.com/gitextensions/gitextensions * Online manual: https://git-extensions-documentation.readthedocs.org/en/latest/
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    Downloads: 233 This Week
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  • 16
    QuickLook

    QuickLook

    Bring macOS “Quick Look” feature to Windows

    Bring macOS “Quick Look” feature to Windows. One of the few features I missed from macOS is Quick Look. It allows users to peek into a file's content at lightning speed by just pressing the Space key. Windows, on the other hand, does not have this handy feature, until now! I am aware that several alternatives are already available on the Internet (e.g. WinQuickLook and Seer). Despite these options, I still decided to craft another one by myself, because they are either not being actively developed, lack variety, or ask for some. Tons of supported file types. Fluent design. Touchscreen friendly. HiDPI support. Preview from the open and save file dialog. Preview from 3rd-party file managers. Easily extended by plugins. Strict GPL license to keep it free forever. Preview next file by clicking on it or using arrow-keys (arrow-keys move selection in the background if the preview window is not in focus).
    Downloads: 51 This Week
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  • 17
    Service Bus Explorer

    Service Bus Explorer

    Connect to a Service Bus namespace and administer messaging entities

    The Service Bus Explorer allows users to connect to a Service Bus namespace and administer messaging entities in an easy manner. The tool provides advanced features like import/export functionality or the ability to test topics, queues, subscriptions, relay services, notification hubs, and events hubs. Microsoft Azure Service Bus is a reliable information delivery service. The purpose of this service is to make communication easier. When two or more parties want to exchange information, they need a communication facilitator. Service Bus is a brokered, or third-party communication mechanism. This is similar to postal service in the physical world. Postal services make it very easy to send different kinds of letters and packages with a variety of delivery guarantees, anywhere in the world. The Service Bus Explorer 2.1.0 can be used with the Service Bus for Windows Server 1.1. The Service Bus Explorer 2.1.0 uses a version of the Microsoft.ServiceBus.dll client library.
    Downloads: 51 This Week
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  • 18
    Windows Calculator

    Windows Calculator

    A simple yet powerful calculator that ships with Windows

    Calculator is the open source version of the Microsoft Windows Calculator application. It is a modern Windows app written in C++ and C#, offering standard, scientific, and programmer modes, unit/currency conversion, date calculations, and history/memory operations. It ships preinstalled with Windows and is actively developed on GitHub. Standard Calculator functionality, which offers basic operations and evaluates commands immediately as they are entered. Scientific Calculator functionality, which offers expanded operations and evaluates commands using the order of operations. Programmer Calculator functionality, which offers common mathematical operations for developers, including conversion between common bases.
    Downloads: 51 This Week
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  • 19
    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: 50 This Week
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  • 20
    Windows Auto Dark Mode

    Windows Auto Dark Mode

    Automatically switches between the dark and light theme of Windows 10

    Switches between the dark and light theme of Windows at scheduled times. Tired of looking at dark content while the sun is shining brightly? But at night everything is suddenly too bright? Auto Dark Mode is the solution for you! Android, iOS and MacOS already offer the possibility of changing the system design based on the time of the day. We're bringing this feature to Windows on a larger scale. Auto Dark Mode helps you to be more productive. Because you shouldn't care about changing Windows settings several times a day. As soon as the sun goes down, we'll take care of your eyes. Because a simple design change would be too boring, Auto Dark Mode is packed with useful functions. For example, we can also change your desktop wallpaper or run custom scripts. Compatible with Windows 10 and Windows 11. Windows .Theme switch, to also change Accent Color, Slideshow and Mouse Cursor.
    Downloads: 50 This Week
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  • 21
    SaveParser

    SaveParser

    Total War Savegame Editor / Parser

    Savegame editor for Total War games savegames. Supports Total War "Warhammer 2", "Warhammer", "Attila", "Rome 2", "Shogun 2", "Napoleon" and "Empire" savegame files, Includes also some tools which could be needed for developer for savegame-based application.
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    Downloads: 362 This Week
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  • 22
    AntiDupl

    AntiDupl

    Search of similar and defective images on the disk.

    Typically, modern computer users have large collections of images in various formats. And then more these collections, then more likely to have the large number of duplicates. The natural desire of the user is to get rid of them. However, if the collection is large enough, do this manually is a very tedious and unproductive work. AntiDupl.NET program will help you automate this process. It can find and display duplicate images in the main graphic formats: JPEG, GIF, TIFF, BMP, PNG, EMF, WMF, EXIF, ICON, JP2, PSD, DDS and TGA. The comparison is based on the contents of the files, so the program can find not only almost identical, but similar images. In addition, the program can find images with some types of defects. AntiDupl.NET program is free and open-source software. It is simple to use, has high speed and accuracy of work, supports Russian and English interface.
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    Downloads: 306 This Week
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  • 23

    Irrlicht Engine

    3D Engine c++

    The Irrlicht Engine is an open source high performance realtime 3D engine written and usable in C++. It is completely cross-platform, using D3D, OpenGL and its own software renderers.
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    Downloads: 226 This Week
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  • 24
    Radegast

    Radegast

    Lightweight client for connecting to Second Life and OpenSim

    Radegast is a virtual world client compatible with Second Life and OpenSimulator. Its main purpose is to provide an alternative client to Linden Lab-derived virtual world viewers. There is a strong focus on accessibility and non-3D interaction. Given the current nature of changes in Second Life, I felt it was prudent to take on another abandoned text-focused viewer. Introducing MEGAbolt, a fork of the METAbolt viewer which was abandoned by its author almost eight years ago. Keep in mind, this is the first version and much has changed under the hood. It has been brought up to date and only supports Windows x64 currently and is built against the .NET 5 platform. Like Radegast, it utilizes the LibreMetaverse library and now shares much of the same code as Radegast does, which should make maintaining both viewers more manageable.
    Downloads: 47 This Week
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  • 25
    Ascii Generator 2
    Ascii Generator 2 (Ascgen2) is an application to convert images into high quality ASCII art - text that accurately represents the original image. The only program of its kind to support variable width fonts and real-time output adjustment and more.
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    Downloads: 201 This Week
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