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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.

  • Auth0 for AI Agents now in GA Icon
    Auth0 for AI Agents now in GA

    Ready to implement AI with confidence (without sacrificing security)?

    Connect your AI agents to apps and data more securely, give users control over the actions AI agents can perform and the data they can access, and enable human confirmation for critical agent actions.
    Start building today
  • 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.
    Try for free
  • 1
    The Album Art Downloader is a program designed to make life easier for anyone who wishes to find and update their album art for their music collection. The sources for the pictures can be defined by creating plugin scripts.
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    Downloads: 678 This Week
    Last Update:
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  • 2
    G-Helper

    G-Helper

    Lightweight Armoury Crate alternative for Asus laptops and ROG Ally

    Small and lightweight Armoury Crate alternative for Asus laptops offering almost same functionality without extra load and unnecessary services. Works with all popular models, such as ROG Zephyrus G14, G15, G16, M16, Flow X13, Flow X16, Flow Z13, DUO, TUF Series, Strix or Scar Series, ProArt, Vivobook, Zenbook, ROG Ally or Ally X and many more.
    Downloads: 148 This Week
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  • 3
    Selenium

    Selenium

    Browser automation framework and ecosystem

    Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily it is for automating web applications for testing purposes, but is certainly not limited to just that. Boring web-based administration tasks can (and should) also be automated as well. If you want to create robust, browser-based regression automation suites and tests, scale and distribute scripts across many environments, then you want to use Selenium WebDriver, a collection of language specific bindings to drive a browser - the way it is meant to be driven. If you want to create quick bug reproduction scripts, create scripts to aid in automation-aided exploratory testing, then you want to use Selenium IDE; a Chrome and Firefox add-on that will do simple record-and-playback of interactions with the browser. If you want to scale by distributing and running tests on several machines and manage multiple environments from a central point.
    Downloads: 142 This Week
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  • 4
    NAnt is a Ant like build tool for .NET
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    Downloads: 753 This Week
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  • Inventors: Validate Your Idea, Protect It and Gain Market Advantages Icon
    Inventors: Validate Your Idea, Protect It and Gain Market Advantages

    SenseIP is ideal for individual inventors, startups, and businesses

    senseIP is an AI innovation platform for inventors, automating any aspect of IP from the moment you have an idea. You can have it researched for uniqueness and protected; quickly and effortlessly, without expensive attorneys. Built for business success while securing your competitive edge.
    Learn More
  • 5
    Lively Wallpaper

    Lively Wallpaper

    Open-source software that allows users to set animated desktops

    Free and open-source software that allows users to set animated desktop wallpapers and screensavers. Lively is the only animated desktop wallpaper application that you will need. Its super easy.. barely an inconvenience, just drag & drop the files or webpages to set as wallpaper. Load HTML file or web address as wallpaper. Runs webgl, javascript.. basically anything that works on chrome. Audio Reactive Wallpaper support. Run GLSL shaders in browser. Custom shader renderer (coming soon.) Shadertoy.com urls are supported as wallpaper. Lively supports Windows screensaver. Any wallpaper can be used as a screensaver. Multiple monitors supported. Lively can be controlled with command-line arguments from the terminal. Can be paired with third-party scripting software like AutoHotkey. Easy to use; Just drag'n'drop media files & webpages into lively window to set it as wallpaper. Hardware accelerated video playback, powered by mpv player.
    Downloads: 137 This Week
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  • 6
    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: 842 This Week
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  • 7
    AlphaClicker

    AlphaClicker

    Windows Autoclicker with a modern UI

    Alpha Clicker is an auto clicker for Windows with a modern user interface. It is open-source, unlike many other auto clickers. Ever got tired of the old design of your auto clicker? This is for you. Just search "Auto clicker" and you will get a bunch of ancient auto clickers (which work but look ancient). It basically works just like any other auto clicker.
    Downloads: 135 This Week
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  • 8
    V2ray Config Pool - Free VPN Config

    V2ray Config Pool - Free VPN Config

    Multi-Protocol VPN Configuration Manager

    V2ray Config Pool - Multi-Protocol Free VPN Configuration Manager Description: V2ray Config Pool is a free Windows application designed for users who need seamless access to global VPN configurations. This powerful tool collects and organizes a wide range of protocols, including VMess, VLESS, Trojan, HTTPS, Shadowsocks, and WireGuard, from over 60 countries based on IPs and locations. Whether you are a VPN enthusiast or a professional looking to optimize your network, V2ray Config Pool makes it easy to find and use configurations tailored to your needs. Key features include: * Global Database: Access a rich pool of configurations and subscriptions from 60+ countries. * Wide Protocol Support: Manage VMess, VLESS, Trojan, Shadowsocks, WireGuard, and more in one place. * Optimized for Performance: Ensure secure, fast, and reliable connections. Empower your networking experience with V2ray Config Pool—a comprehensive and free solution for global VPN access!
    Downloads: 1,951 This Week
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  • 9
    EarTrumpet

    EarTrumpet

    Volume Control for Windows

    Take full control of all your audio with EarTrumpet! EarTrumpet is a simple, easy-to-use volume control program for Windows that lets you easily control the volume of specific channels. If you've ever wanted to individually control the volume of everything on your Windows PC, or have grown tired of shifting the volume between apps like Skype and Spotify, EarTrumpet is the best option for you. With EarTrumpet you can cease constantly adjusting your volume to whatever it is you are currently listening to. Simply adjust the volume once for every app you use, and sit back and enjoy the perfect level of volume every time. EarTrumpet also comes with some nifty features, such as multi-channel aware peaking, default playback device management, configurable hotkeys and more.
    Downloads: 131 This Week
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  • Simplify Purchasing For Your Business Icon
    Simplify Purchasing For Your Business

    Manage what you buy and how you buy it with Order.co, so you have control over your time and money spent.

    Simplify every aspect of buying for your business in Order.co. From sourcing products to scaling purchasing across locations to automating your AP and approvals workstreams, Order.co is the platform of choice for growing businesses.
    Learn More
  • 10

    Zefania XML Bible Markup Language

    Zefania XML bible modules

    Zefania XML bible modules can be viewed with: Simple Bible Reader (see files) Zefania XML Language Documentation can be found here: https://bgfdb.de/zefaniaxml/bml/
    Leader badge
    Downloads: 644 This Week
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  • 11
    Vividl - Video Downloader

    Vividl - Video Downloader

    Free video downloader for YouTube and hundreds of other websites

    Vividl is a Windows app that lets you download videos from various websites, including YouTube, Soundcloud, Vimeo, Dailymotion and various media channels. It uses the popular downloader youtube-dl/ yt-dlp to extract videos from several hundred websites. Just copy a video URL, paste it in Vividl and download the video in different qualities, convert it to other formats or to an audio track. You can also manage the parallel download of multiple videos and retrieve additonal meta information using the simple UI. VirusTotal check: https://www.virustotal.com/gui/file/a3beb31028f81bd8178e57aeae3f39f492cd1e905dc077b0d943b4b58e6dfc81/detection Get support: https://sourceforge.net/p/vividl/discussion https://github.com/bluegrams/vividl/issues Support the development: https://ko-fi.com/alxnull
    Leader badge
    Downloads: 1,044 This Week
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  • 12
    Outlook CalDav Synchronizer

    Outlook CalDav Synchronizer

    Sync Outlook with Google, SOGo or any other CalDAV / CardDAV server

    Free Outlook Plugin, which synchronizes events, tasks and contacts between Outlook and Google, SOGo, NextCloud, Horde or any other CalDAV or CardDAV server. Supported Outlook versions are 2021, 2019, 2016, 2013, 2010 and 2007 and Office 365 for Desktop. This project was initially developed as a master thesis project at the University of Applied Sciences Technikum Wien, Software Engineering Degree program. Outlook CalDav Synchronizer is Free and Open-Source Software (FOSS), still you can support the project by donating on Sourceforge or directly within the About dialog of our Plugin. Contact us for enterprise support at https://caldavsynchronizer.org/enterprise/contact
    Leader badge
    Downloads: 568 This Week
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  • 13
    NAPS2 - Not Another PDF Scanner

    NAPS2 - Not Another PDF Scanner

    Scan documents to PDF and other file types, as simply as possible.

    Visit NAPS2's home page at www.naps2.com. NAPS2 is a document scanning application with a focus on simplicity and ease of use. Scan your documents from WIA- and TWAIN-compatible scanners, organize the pages as you like, and save them as PDF, TIFF, JPEG, PNG, and other file formats. Available on Windows, Mac, and Linux. NAPS2 is currently available in over 40 different languages. Want to see NAPS2 in your preferred language? Help translate! See the wiki for more details.
    Leader badge
    Downloads: 488 This Week
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  • 14
    Key Presser

    Key Presser

    Fully Configurable Automatic Keyboard Presser

    Current stable release: Key Presser V4.4. Key Presser is a tool that can automatically press any key combination repeatedly or a set amount. It's ideal for gaming and it has a DARK MODE! The key pressing can start and stop with any hotkey of your choice.
    Leader badge
    Downloads: 1,442 This Week
    Last Update:
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  • 15
    YAT

    YAT

    Yet Another Terminal :: Serial Communication :: Engineer/Test/Debug

    Engineering, testing and debugging of serial communication. Supports RS-232/422/423/485 as well as TCP/IP Client/Server/AutoSocket, UDP/IP Client/Server/PairSocket and USB Ser/HID. Optimized for simple command sets of e.g. embedded systems.
    Leader badge
    Downloads: 524 This Week
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  • 16
    ContextMenuManager

    ContextMenuManager

    Windows tool to manage and customize right-click context menus

    ContextMenuManager is a Windows utility for enabling, disabling, renaming, icon-editing, deleting, and adding entries to the file/folder, New, Send To, Open With, IE, and Win+X context menus. It features a friendly UI, registry navigation, and multi-language support. Ideal for users seeking granular control over system context options on Windows 7 through 11.
    Downloads: 109 This Week
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  • 17
    UniGetUI

    UniGetUI

    The Graphical Interface for your package managers

    The main goal of this project is to create an intuitive GUI for the most common CLI package managers for Windows 10 and 11, such as WinGet, Scoop, Chocolatey, Pip, Npm, .NET Tool, and PowerShell Gallery. With this app, you can easily download, install, update, and uninstall any software published on the supported package managers.
    Downloads: 105 This Week
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  • 18
    Mass Image Compressor

    Mass Image Compressor

    Compress, Convert, Watermark and Resize Images/Photographs in bulk

    Reduces up to 90% image size and still keeps the image clarity pristine. Mass Image Compressor (MIC) is one of the most popular, reliable, easy-to-use utility to compress, convert, watermark and resize multiple images at once. Just drag & drop the files and folder and it will compress all images. Best for website image optimization, photographs, game assets, animated image compression. Input: Almost all popular image format, including raw camera format Output: JPEG, PNG, WebP, GIF, AVIF Microsoft Store (If you want to support 💰 project): https://apps.microsoft.com/detail/9NF6R54S63L3?cid=sf Install via Winget: https://mic.cognirush.com/install-via-winget/ Portable version: Check out "Files" or our github release page. Give us Github Star ⭐ at https://github.com/Cognirush-Labs-LLP/icompress-win  macOS option: https://mic.cognirush.com/macos/
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    Downloads: 473 This Week
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  • 19
    Shadowsocks for Windows

    Shadowsocks for Windows

    A secure socks5 proxy for Windows

    Shadowsocks for Windows is a free and open source, high-performance secured socks5 proxy designed to protect your internet traffic. It allows you to surf the web privately and securely, and offers a number of useful features such as HTTP proxy support, system proxy configuration, server auto switching and plugin support. Shadowsocks is incredibly fast, as it utilizes bleeding edge techniques with Asynchronous I/O and event-driven programming. It also has a flexible industry-level encryption algorithm that supports custom algorithms. Shadowsocks for Windows requires a Microsoft .NET Framework 4.7.2 or higher, as well as Microsoft Visual C++ 2015 Redistributable (x86).
    Downloads: 99 This Week
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  • 20
    NBFC

    NBFC

    NoteBook FanControl

    NBFC is a cross-platform fan control service for notebooks. It comes with a powerful configuration system, which allows to adjust it to many different notebook models. Currently, there are no pre-built releases for Linux, but you can easily build NBFC yourself. In general the NBFC Wiki is the first place to go if you have any questions. If you want to build NBFC from source, the first thing you have to do is to download the source code. You can easily clone the NBFC repository via git. Make sure the Mono runtime + development tools are installed on your machine (Debian based distros: mono-complete, Arch based distros: mono). Config files are an integral part of NBFC, because they define how NBFC interacts with your notebook's embedded controller (EC). The EC, among other things, monitors your system's temperatures and controls the fan(s). It usually sits on the motherboard or is integrated into a Super I/O chip and is connected to the Southbridge via the Low Pin Count (LPC) bus.
    Downloads: 98 This Week
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  • 21

    Video Screensaver

    A Windows screensaver that plays videos, with or without sound.

    A basic video player screensaver for Windows, written in C#. Requires .NET 4.5 runtimes. Compatible with most video formats. Hard to find good alternatives out there, so I wrote my own.
    Leader badge
    Downloads: 473 This Week
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  • 22
    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
    Leader badge
    Downloads: 650 This Week
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  • 23
    Captura

    Captura

    Capture Screen, Audio, Cursor, Mouse Clicks and Keystrokes

    Capture Screen, WebCam, Audio, Cursor, Mouse Clicks and Keystrokes. Captura is 100% free. You don't need to spend a penny. You can support by donating or just starring the repository. Source-code for Captura is available on GitHub under the terms of the MIT license. Available in over 30 languages. Very simple to translate. Captura can run unobtrusively remaining minimized to the System Tray. Hello developers! Captura can be used from your terminal. Only for Portable builds. Take ScreenShots and control recordings from the keyboard even when Captura is in System Tray using Configurable Hotkeys. Captura can do the much-demanded task of mixing Microphone input audio and Speaker output audio. Mouse Clicks and Keystrokes can be shown in the recordings. Options are present for customization. Captura can capture specific regions using the Region Selector.
    Downloads: 96 This Week
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  • 24
    downkyi

    downkyi

    Bilibili video downloader supporting 8K, batch, and toolbox tools

    downkyi is an open-source downloader for Bilibili videos. It features a clean UI, QR-code login, batch downloads, support for 8K, HDR, Dolby Vision, audio/video extraction, watermark removal, and subtitle/danmaku retrieval. It leverages aria2c for multi-threaded downloading and FFmpeg for muxing and processing.
    Downloads: 95 This Week
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  • 25
    iTextSharp

    iTextSharp

    .NET port of the iText library

    iTextSharp consists of several dlls. .NET port of the iText library, only security fixes will be added.
    Downloads: 94 This Week
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