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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.

  • MongoDB Atlas runs apps anywhere Icon
    MongoDB Atlas runs apps anywhere

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

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    Simple, Secure Domain Registration

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    Register or renew your domain and pay only what we pay. No markups, hidden fees, or surprise add-ons. Choose from over 400 TLDs (.com, .ai, .dev). Every domain is integrated with Cloudflare's industry-leading DNS, CDN, and free SSL to make your site faster and more secure. Simple, secure, at-cost domain registration.
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  • 1
    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.
    Leader badge
    Downloads: 427 This Week
    Last Update:
    See Project
  • 2
    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: 90 This Week
    Last Update:
    See Project
  • 3
    netch

    netch

    A simple proxy client

    Netch is an open-source Windows proxy client written in C#, designed for both gaming and general web acceleration. It supports various proxy protocols—Socks5, Shadowsocks, ShadowsocksR, Trojan, VMess, VLESS—and multiple operation modes including process-level interception, shared network, tun/tap virtual adapters, and web proxy. Extensively configurable, it’s ideal for users managing traffic routing per application.
    Downloads: 89 This Week
    Last Update:
    See Project
  • 4
    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: 88 This Week
    Last Update:
    See Project
  • Photo and Video Editing APIs and SDKs Icon
    Photo and Video Editing APIs and SDKs

    Trusted by 150 million+ creators and businesses globally

    Unlock Picsart's full editing suite by embedding our Editor SDK directly into your platform. Offer your users the power of a full design suite without leaving your site.
    Learn More
  • 5
    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: 87 This Week
    Last Update:
    See Project
  • 6

    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: 418 This Week
    Last Update:
    See Project
  • 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: 85 This Week
    Last Update:
    See Project
  • 8

    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: 408 This Week
    Last Update:
    See Project
  • 9
    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: 416 This Week
    Last Update:
    See Project
  • Get the most trusted enterprise browser Icon
    Get the most trusted enterprise browser

    Advanced built-in security helps IT prevent breaches before they happen

    Defend against security incidents with Chrome Enterprise. Create customizable controls, manage extensions and set proactive alerts to keep your data and employees protected without slowing down productivity.
    Download Chrome
  • 10
    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/
    Leader badge
    Downloads: 385 This Week
    Last Update:
    See Project
  • 11
    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: 378 This Week
    Last Update:
    See Project
  • 12
    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: 81 This Week
    Last Update:
    See Project
  • 13
    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: 80 This Week
    Last Update:
    See Project
  • 14

    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: 663 This Week
    Last Update:
    See Project
  • 15
    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 Problem with Windows Security or want to help the project financially? Download signed installer from Microsoft Store https://apps.microsoft.com/detail/9NF6R54S63L3?cid=sf Install via Winget: https://mic.cognirush.com/install-via-winget/ Give us Github Star ⭐ at https://github.com/Cognirush-Labs-LLP/icompress-win macOS option: https://mic.cognirush.com/macos/
    Leader badge
    Downloads: 355 This Week
    Last Update:
    See Project
  • 16
    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: 76 This Week
    Last Update:
    See Project
  • 17
    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
    Leader badge
    Downloads: 328 This Week
    Last Update:
    See Project
  • 18
    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: 75 This Week
    Last Update:
    See Project
  • 19
    Subtitle Edit

    Subtitle Edit

    The subtitle editor

    Subtitle Edit (SE) is a free, open‑source subtitle editor for creating, editing, synchronizing, and converting subtitles. It supports a wide range of formats (over 300) and offers both graphical and text-based editing views.  Easy insertion, deletion, and shift of subtitle lines. Portable versions available (.NET 4.8, 32/64-bit), runs on Windows and via compatibility on Linux. Active development with frequent updates and issue tracking. Plugin support and rich editing tools (e.g., translation, spellcheck, sync).
    Downloads: 74 This Week
    Last Update:
    See Project
  • 20
    PEASS-ng

    PEASS-ng

    Privilege Escalation Awesome Scripts SUITE

    These tools search for possible local privilege escalation paths that you could exploit and print them to you with nice colors so you can recognize the misconfigurations easily. All the scripts/binaries of the PEAS suite should be used for authorized penetration testing and/or educational purposes only. Any misuse of this software will not be the responsibility of the author or of any other collaborator. Use it at your own machines and/or with the owner's permission. Here you will find privilege escalation tools for Windows and Linux/Unix and MacOS. Find the latest versions of all the scripts and binaries in the releases page. Check the parsers directory to transform PEASS outputs to JSON, HTML and PDF.
    Downloads: 70 This Week
    Last Update:
    See Project
  • 21
    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: 348 This Week
    Last Update:
    See Project
  • 22
    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.
    Leader badge
    Downloads: 318 This Week
    Last Update:
    See Project
  • 23
    99 Nights In The Forest Script / Keyless

    99 Nights In The Forest Script / Keyless

    99 Nights Script No Key: Kill Aura, Auto Combat, Auto Craft, & other

    Download 99 Nights In The Forest Script | Keyless for free. 99 Nights Script Keyless : Kill Aura, Auto Farm, Auto Craft, & other. Transform into any creature, fly or noclip freely, see clearly with fullbright, teleport instantly, move faster with infinite jump, auto-gather and refill resources, and dominate battles with built-in killaura, defense boosts, and more.
    Downloads: 515 This Week
    Last Update:
    See Project
  • 24
    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!
    Leader badge
    Downloads: 279 This Week
    Last Update:
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  • 25
    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: 313 This Week
    Last Update:
    See Project
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