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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.

  • Our Free Plans just got better! | Auth0 Icon
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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
    FModel

    FModel

    Unreal Engine Archives Explorer

    FModel is a freeware application designed to explore Unreal Engine games archives, allowing users to delve into the assets and structures of games developed with Unreal Engine.
    Downloads: 92 This Week
    Last Update:
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  • 2
    ImageGlass

    ImageGlass

    A lightweight, versatile image viewer

    ImageGlass is a lightweight and versatile image viewer for Windows, offering a clean, modern interface and supporting over 80 image formats, including WEBP, GIF, SVG, PNG, JXL, HEIC, and RAW. It’s fast, customizable, and designed for streamlined image browsing. ImageGlass is a lightweight software designed for seamless viewing of images in a clean and intuitive interface. With support for over 88 common image formats, including WEBP, GIF, SVG, PNG, JXL, HEIC, ImageGlass also offers advanced features that cater to the needs of both regular users and designers, making it an excellent tool to enhance workflow efficiency. If you want to support the development of ImageGlass, you can purchase ImageGlass from Microsoft Store.
    Downloads: 91 This Week
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  • 3
    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: 425 This Week
    Last Update:
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  • 4
    TunMod VPN Client

    TunMod VPN Client

    TunMod VPN Client

    TunMod VPN Client is a Windows App designed for secure VPN tunneling and seamless server connections. Featuring Payload Generator, SSH Client, SSL/TLS Tunneling, and multi-profile management, it allows for customized, encrypted connections. TunMod also supports V2Ray, Xray, and XTLS protocols,l2tp,PPTP,HTTPS,OpenVPN, making it a comprehensive solution for advanced tunneling needs. Any suggestions or bug reports: tunmodsupp@gmail.com https://github.com/TunMod/TunMod-VPN-Client
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    Downloads: 836 This Week
    Last Update:
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  • Loan management software that makes it easy. Icon
    Loan management software that makes it easy.

    Ideal for lending professionals who are looking for a feature rich loan management system

    Bryt Software is ideal for lending professionals who are looking for a feature rich loan management system that is intuitive and easy to use. We are 100% cloud-based, software as a service. We believe in providing our customers with fair and honest pricing. Our monthly fees are based on your number of users and we have a minimal implementation charge.
    Learn More
  • 5
    Night Mode for Windows

    Night Mode for Windows

    Tool to help dimming screen on Microsoft Windows systems

    This program is designed for people who like dark screens and want to protect their eyes. So if your monitor is too bright, especially during the night - even if you set the brightness to minimum, download Night Mode for Windows - a small tool to dim your whole desktop and all windows on all monitors. You may also use global keyboard shortcuts: CTRL + Windows key + F11 to decrease brightness CTRL + Windows key + F12 to increase brightness CTRL + Windows key + F9 to maximum dim the screen (boss-key) CTRL + Windows key + F10 to change brightness to maximum There is also possible to set initial value of brightness when starting the program, just add argument in percent (without % sign). This example will dim your brightness at 30%: nightmode.exe 30 This program is free for personal & commercial use. It works on all Windows XP and higher (2k/2003/Vista/2008/7/8/8.1/10) both in 32-bit and 64-bit editions. It may require .NET 4.0 framework.
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    Downloads: 475 This Week
    Last Update:
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  • 6
    WillowTree#
    WillowTree# is a save editor for Borderlands written in C#. It can read, edit, and convert savegame files from PC, PS3, and Xbox 360 versions of the Borderlands game. It has a storage locker that can be used to transfer items between characters.
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    Downloads: 414 This Week
    Last Update:
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  • 7
    StabilityMatrix

    StabilityMatrix

    Multi-Platform Package Manager for Stable Diffusion

    StabilityMatrix is a project that helps organize, evaluate, and compare generative AI models and their behavior across prompts, datasets, or configuration settings. It provides a framework to run experiments systematically—capturing inputs, model configurations, outputs, and metrics—so researchers and practitioners can reason about differences in quality, robustness, and failure modes. The repository often bundles tooling for automated prompt sweeping, scoring heuristics (such as diversity, coherence, or task-specific metrics), and visualization helpers to make comparisons interpretable. This approach is useful for model selection, prompt engineering, and benchmarking new checkpoints against baseline models under reproducible conditions. By turning ad-hoc tests into tracked experiments, StabilityMatrix reduces bias, surfaces subtle regressions, and accelerates iteration when tuning generative systems.
    Downloads: 88 This Week
    Last Update:
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  • 8
    This plugin mimics the "open selected file" in PSPad. I am a PHP developer and i often see an 'require_once("../this/is/some/file.php");'. In pspad you can select the whole path (../this/is/some/file.php) and open it from the menu. Now you can do the same in notepad++. Just select the whole path and press alt+o, or use the button in the toolbar on top. It will open the file automatically. The plugin understands the relative path. The code is also available on https://bitbucket.org/sgezel/quickopenplugin
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    Downloads: 584 This Week
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  • 9
    PKHeX

    PKHeX

    Pokémon Save File Editor

    Pokémon core series save editor, programmed in C#. Data is displayed in a view that can be edited and saved. The interface can be translated with resource/external text files so that different languages can be supported. Pokémon Showdown sets and QR codes can be imported/exported to assist in sharing. PKHeX expects to save files that are not encrypted with console-specific keys. Use a save data manager to import and export save data from the console (Checkpoint, save_manager, JKSM, or SaveDataFiler). We do not support or condone cheating at the expense of others. Do not use significantly hacked Pokémon in battle or in trades with those who are unaware hacked Pokémon are in use. PKHeX is a Windows Forms application that requires .NET Framework v4.6, with experimental support for .NET 6.0. The executable can be built with any compiler that supports C# 10.
    Downloads: 87 This Week
    Last Update:
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  • Cloud-based help desk software with ServoDesk Icon
    Cloud-based help desk software with ServoDesk

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    What if You Could Automate 90% of Your Repetitive Tasks in Under 30 Days? At ServoDesk, we help businesses like yours automate operations with AI, allowing you to cut service times in half and increase productivity by 25% - without hiring more staff.
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  • 10
    RED searches and deletes empty directories recursively below a given start folder and shows the result in a well arranged tree. Further you can create some custom rules for keeping and deleting folders. Empty files in directories can also be ignored.
    Leader badge
    Downloads: 435 This Week
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  • 11
    MeGUI
    MeGUI is the most comprehensive GUI based ISO MPEG-4 solution. It suports MPEG-4 ASP (xvid), MPEG-4 AVC (x264), AAC, MP2, MP3, Flac, Vorbis, AC3 audio and various common containers support (MP4, MKV, AVI, M2TS).
    Leader badge
    Downloads: 414 This Week
    Last Update:
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  • 12
    RyTuneX

    RyTuneX

    RyTuneX is a cutting-edge optimizer built with the WinUI 3 framework

    RyTuneX is a comprehensive Windows-system optimization tool aimed at users who want to enhance performance, privacy and usability on systems running Windows 10 (20H1 +) and Windows 11. It is built using the WinUI 3 framework and .NET 8 to provide a modern, responsive interface and native Windows look and feel. The application lets users “debloat” their system by removing pre-installed apps and Windows features that may be unnecessary or resource-heavy, helping free up resources and storage. It also offers system tweaks to improve responsiveness, reduce background overhead, and optimize system settings for gaming or heavy usage workflows. Privacy enhancements are part of its core offering: toggles for telemetry, data-collection features, background apps and more give users greater control over what their OS is tracking or doing under the hood.
    Downloads: 82 This Week
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  • 13
    mpv.net

    mpv.net

    mpv.net is a modern media player for Windows that works just like mpv

    mpv.net is a modern desktop media player for Windows based on the popular mpv player. mpv.net is designed to be mpv compatible, almost all mpv features are available because they are all contained in libmpv, this means the official mpv manual applies to mpv.net. mpv focuses on the usage of the command line and the terminal, mpv.net retains the ability to be used from the command line and the terminal and adds a modern Windows GUI on top of it. Video output that is capable of many features loved by videophiles, such as video scaling with popular high-quality algorithms, color management, frame timing, interpolation, HDR, and more. Leverages the FFmpeg hwaccel APIs to support DXVA2 video decoding acceleration. mpv.net is based on libmpv which offers a straightforward C API that was designed from the ground up to make mpv usable as a library and facilitate easy integration into other applications. mpv is like VLC not based on DirectShow or Media Foundation.
    Downloads: 82 This Week
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  • 14
    GO Contact Sync Mod

    GO Contact Sync Mod

    Sync Outlook contacts and calendars with Google

    Please install the latest version >4.0, because it uses the new Google People API. The Google Contacts API is now deprecated and is scheduled for sunset on June 15, 2021. GO Contact Sync Mod synchronizes your Microsoft Outlook contacts with your Google Mail address book, including pictures, categories and contact notes. It also syncs your Outlook Calendar Appointments on demand to Google Calendar. This Mod fork adds many enhancements and bug fixes to the obviously dead project 'Go Contact Sync'. Minimum requirement for GO Contact Sync Mod is .NET 4.7.2 and Windows 7 (32 or 64 bit).
    Leader badge
    Downloads: 377 This Week
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  • 15

    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.
    Leader badge
    Downloads: 388 This Week
    Last Update:
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  • 16
    SharpDevelop

    SharpDevelop

    A free IDE for C#, VB.NET, & Boo projects on Microsoft's .NET platform

    SharpDevelop is the open-source IDE for the .NET platform. Write applications in languages including C#, VB.NET, F#, IronPython and IronRuby, as well as target rich and reach: Windows Forms or WPF, as well as ASP.NET MVC and WCF. It starts from USB drives, supports read-only projects, comes with integrated unit and performance testing tools, Git, NuGet and a lot more features that make you productive as a developer.
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    Downloads: 342 This Week
    Last Update:
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  • 17
    Screen Ruler

    Screen Ruler

    Ruler tool for measuring in pixels, centimeters, inches and points

    Screen Ruler is a lightweight and configurable ruler tool for Windows Desktop. It allows you to measure the size of elements on the screen in different units, including pixels, centimeters and inches. Measuring is possible either using a two-dimensional, rectangular ruler scale or a one-dimensional, horizontal or vertical scale. The ruler can be moved and resized precisely using either the mouse or the keyboard and custom marking lines can be added. Besides coming with a light and a dark theme, Screen Ruler also allows you to fully customize its appearance by changing all color settings. Get support: https://sourceforge.net/p/screenruler/discussion/ https://github.com/bluegrams/ScreenRuler/issues Support the development: https://ko-fi.com/alxnull
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    Downloads: 415 This Week
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  • 18
    RoboMirror's aim is to provide a very simple and user-centered GUI for Robocopy to allow for easy synchronization of two directory trees, e.g., to perform a robust incremental backup, both locally (e.g., to an external hard disk) and across the network. Additionally, RoboMirror supports volume shadow copies. By using shadow copies, all files can be copied, including files locked by running processes (Outlook, SQL Server...).
    Leader badge
    Downloads: 403 This Week
    Last Update:
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  • 19

    Kickass Undelete

    A free, open source file recovery tool for Windows.

    Kickass Undelete is a free, fully featured, file recovery tool for Windows. Accidentally deleted a file? Never fear; the data is probably still on your drive and may be recoverable. Kickass Undelete finds all of the deleted files on your hard drive, flash drive or SD card and allows you to recover them.
    Leader badge
    Downloads: 681 This Week
    Last Update:
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  • 20
    ModAssistant

    ModAssistant

    Simple Beat Saber Mod Installer

    ModAssistant is a simple PC mod installer for Beat Saber, using mods from BeatMods. Beat Saber is the popular VR rhythm game where players must slash the beats as they fly towards them to the beat of lively music. ModAssistant comes with a number of great features like dependency resolution, mod uninstallation, and a complex theming engine. It features light, dark, BSMG and light pink themes, and can even have your own custom theme! Have more fun playing Beat Saber by customizing your experience with ModAssistant!
    Downloads: 78 This Week
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  • 21
    Arduino ASCOM Focuser Pro2 DIY

    Arduino ASCOM Focuser Pro2 DIY

    Version 2 of the myFocuser Project

    myFocuserPro2 (myFP2) is an ASCOM - INDI - LINUX - WINDOWS telescope focuser with a large range of options. 309,000+ file downloads. The most popular focuser project. (c) Copyright Robert Brown 2014-2025. All Rights Reserved. Code or portions of code may not be copied or used without written permission from the author. Other Focuser Projects myFP2ESP32 WiFi - https://sourceforge.net/projects/myfocuserpro2-esp32/ [ESP32 Only] myFP2ESP8266 WiFi - https://sourceforge.net/projects/myfp2esp8266-focus-controller/ myFP2N - Nextion touch screen display - https://sourceforge.net/projects/arduinoascomfocuserpro2diy/files/myFocuserPro2N%20NEXTION%20TFT%20DISPLAY/ myFP2M - Ready made Controllers https://sourceforge.net/projects/arduinoascomfocuserpro2diy/files/myFocuserPro2M/ Please look in the Files-Documents folder for more information. https://sourceforge.net/projects/arduinoascomfocuserpro2diy/files/Documentation/
    Leader badge
    Downloads: 358 This Week
    Last Update:
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  • 22
    Virastyar

    Virastyar

    Virastyar is an spell checker for low-resource languages

    Virastyar is a free and open-source (FOSS) spell checker. It stands upon the shoulders of many free/libre/open-source (FLOSS) libraries developed for processing low-resource languages, especially Persian and RTL languages Publications: Kashefi, O., Nasri, M., & Kanani, K. (2010). Towards Automatic Persian Spell Checking. SCICT. Kashefi, O., Sharifi, M., & Minaie, B. (2013). A novel string distance metric for ranking Persian respelling suggestions. Natural Language Engineering, 19(2), 259-284. Rasooli, M. S., Kahefi, O., & Minaei-Bidgoli, B. (2011). Effect of adaptive spell checking in Persian. In NLP-KE Contributors: Omid Kashefi Azadeh Zamanifar Masoumeh Mashaiekhi Meisam Pourafzal Reza Refaei Mohammad Hedayati Kamiar Kanani Mehrdad Senobari Sina Iravanin Mohammad Sadegh Rasooli Mohsen Hoseinalizadeh Mitra Nasri Alireza Dehlaghi Fatemeh Ahmadi Neda PourMorteza
    Leader badge
    Downloads: 359 This Week
    Last Update:
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  • 23
    iCopy - Free Photocopier

    iCopy - Free Photocopier

    Print your copies using your scanner and printer as a photocopier

    iCopy lets you combine your scanner and printer into a powerful, but easy to use photocopier by only pressing a button. Its simple user interface lets you manage scanner and printer options with a few clicks.
    Leader badge
    Downloads: 339 This Week
    Last Update:
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  • 24
    PinWin - Pin On Top

    PinWin - Pin On Top

    Pin any window to be always on top of the screen

    PinWin is a minimal Windows system tray application that allows you to pin any windows to the top of the screen with one click. Support the development: https://ko-fi.com/alxnull
    Leader badge
    Downloads: 552 This Week
    Last Update:
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  • 25

    KPEnhancedEntryView

    An enhanced entry view panel for KeePass

    This is a plugin to KeePass <http://www.KeePass.info> to provide an enhanced entry view. For the rationale and design behind this project, see the forum post linked to as the homepage
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    Downloads: 329 This Week
    Last Update:
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