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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
  • Cloud tools for web scraping and data extraction Icon
    Cloud tools for web scraping and data extraction

    Deploy pre-built tools that crawl websites, extract structured data, and feed your applications. Reliable web data without maintaining scrapers.

    Automate web data collection with cloud tools that handle anti-bot measures, browser rendering, and data transformation out of the box. Extract content from any website, push to vector databases for RAG workflows, or pipe directly into your apps via API. Schedule runs, set up webhooks, and connect to your existing stack. Free tier available, then scale as you need to.
    Explore 10,000+ tools
  • 1
    KeePass

    KeePass

    A lightweight and easy-to-use password manager

    KeePass Password Safe is a free, open source, lightweight, and easy-to-use password manager for Windows, Linux and Mac OS X, with ports for Android, iPhone/iPad and other mobile devices. With so many passwords to remember and the need to vary passwords to protect your valuable data, it’s nice to have KeePass to manage your passwords in a secure way. KeePass puts all your passwords in a highly encrypted database and locks them with one master key or a key file. As a result, you only have to remember one single master password or select the key file to unlock the whole database. And the databases are encrypted using the best and most secure encryption algorithms currently known, AES and Twofish. See our features page for details.
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    Downloads: 200,088 This Week
    Last Update:
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  • 2
    Bulk Crap Uninstaller

    Bulk Crap Uninstaller

    Remove large amounts of unwanted applications quickly.

    Bulk Crap Uninstaller (in short BCUninstaller or BCU) is a free (as in speech and beer) bulk program uninstaller with advanced automation. It excels at removing large amounts of applications with minimal to no user input, while requiring next to no technical knowledge. It can detect most applications and games (even portable or not registered), clean up leftovers, force uninstall, automatically uninstall according to premade lists, and much more. Bulk Crap Uninstaller is licensed under Apache 2.0 open source license, and can be used in both private and commercial settings for free and with no obligations, as long as no conditions of the license are broken.
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    Downloads: 7,802 This Week
    Last Update:
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  • 3
    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: 2,089 This Week
    Last Update:
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  • 4
    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: 6,317 This Week
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  • Create and run cloud-based virtual machines. Icon
    Create and run cloud-based virtual machines.

    Secure and customizable compute service that lets you create and run virtual machines.

    Computing infrastructure in predefined or custom machine sizes to accelerate your cloud transformation. General purpose (E2, N1, N2, N2D) machines provide a good balance of price and performance. Compute optimized (C2) machines offer high-end vCPU performance for compute-intensive workloads. Memory optimized (M2) machines offer the highest memory and are great for in-memory databases. Accelerator optimized (A2) machines are based on the A100 GPU, for very demanding applications.
    Try for free
  • 5
    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.
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    Downloads: 488 This Week
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  • 6
    Provides optical character recognition (OCR) solutions for Vietnamese language.
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    Downloads: 215 This Week
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  • 7
    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: 141 This Week
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  • 8
    GEDKeeper

    GEDKeeper

    GEDKeeper - opensource and crossplatform genealogy management program

    GEDKeeper program is developed for work with personal genealogical database. The program is designed for extremely simple and intuitive interface. The program is very easy to install on the computer, fully supports the GEDCOM format, has no restrictions on the number of persons and generations, allows you to generate pedigrees, building several tree species, as well as print and save their images, provides fast navigation, filtering, searching and adding multimedia materials. In addition there is an output of geographic data on Google maps (© Google). The aim of the program is as quick and effective means of conducting personal genealogical database. We invite native speakers to improve the translation of the program on the Crowdin platform: https://crowdin.com/project/gedkeeper Project is published on GitHub, url: https://github.com/Serg-Norseman/GEDKeeper
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    Downloads: 156 This Week
    Last Update:
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  • 9
    Sucrose

    Sucrose

    Sucrose Wallpaper Engine

    Sucrose is a versatile wallpaper engine that brings life to your desktop with a wide range of interactive wallpapers.
    Downloads: 144 This Week
    Last Update:
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  • Award-Winning Medical Office Software Designed for Your Specialty Icon
    Award-Winning Medical Office Software Designed for Your Specialty

    Succeed and scale your practice with cloud-based, data-backed, AI-powered healthcare software.

    RXNT is an ambulatory healthcare technology pioneer that empowers medical practices and healthcare organizations to succeed and scale through innovative, data-backed, AI-powered software.
    Learn More
  • 10
    MediaPortal

    MediaPortal

    Turn your PC into a very advanced MediaCenter/HTPC

    MediaPortal turns your PC into a very advanced MediaCenter / HTPC. It allows you to listen to your favorite music & radio, watch and store your videos and DVDs, view, schedule and record live TV as a digital video recorder and much much more
    Downloads: 34 This Week
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  • 11
    SystemTrayMenu

    SystemTrayMenu

    SystemTrayMenu - Browse and open your files easily

    SystemTrayMenu is an open source 'Desktop Toolbar' or 'Start Menu' alternative. It offers a clear, personalized menu which can be controlled via keyboard, mouse or touchscreen. Files, links and folders are organized in several levels as dropdown menus. Various options like appearance, hotkey, autostart and behavior can be adjusted. It is written in C# and using .NET 7. SystemTrayMenu is portable, so it does not need to be installed. After downloading the zip file, unzip the folder, then start SystemTrayMenu.exe. After starting the application the first time you have to choose the root directory. In this directory you should put shortcuts, files and folders (App, Game, Script, URL, Network), which you are often using and especially when you can not find them over the windows start menu search. You can also consider to put there all files from your desktop. If you have ideas, questions or a problem you can contact the developer Markus Hofknecht via GitHub or email.
    Downloads: 27 This Week
    Last Update:
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  • 12
    FCKeditor

    FCKeditor

    FCKeditor (retired)

    FCKeditor is the previous version of CKEditor and has been discontinued after version 2. The new CKEditor is redesigned from the ground up, offering more WYSIWYG text editing features, enhanced security and better integration. Don’t force yourself with retro FCKeditor. Switch to the new, cool CKEditor at ckeditor.com
    Downloads: 15 This Week
    Last Update:
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  • 13

    FSRadio-Remote

    Control your Frontier-Silicon Radio Devices from Windows Desktop

    FSRadio-Remote is a portable application for Windows Desktop that allows to control Frontier-Silicon chipset based Radio devices. • Installation: Download "FSRadio-Remote.zip", unzip it where you want and run "FSRadio-Remote.exe". It is advisable to set tray-icon as always visible in Windows settings. • Compatibility: Internet Radio devices based on the Frontier Silicon technology such as some from the following manufacturers: Hama, Medion, Technisat, Dual, Sangean, Roberts, Revo, Ruark, Silvercrest, Auna, Como Audio. Pinell devices require specific port: "IP:2244". In theory any device working with UNDOK should work with FSRadio-Remote too. http://frontier-silicon.com/undok https://github.com/openhab/openhab/wiki/Frontier-Silicon-Radio-Binding • Disclaimer: This is a Beta version that I developed for personal use. It is based on the « Frontier Silicon API for .NET » (https://github.com/z1c0/FsApi) Eric Marchesin (eric.dev@laposte.net) December 2016-2020
    Downloads: 10 This Week
    Last Update:
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  • 14
    Gnome Subtitles
    Gnome Subtitles is a subtitle editor for the GNOME desktop. It supports the most common text-based subtitle formats, video previewing, timings synchronization and subtitle translation.
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    Downloads: 24 This Week
    Last Update:
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  • 15
    Notepad X
    Notepad X is an alternative open source text editor for Microsoft Windows, with a lot of customization options created to help users managing text documents featuring tab navigation.
    Downloads: 7 This Week
    Last Update:
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  • 16
    Greenshot - Screen Recorder

    Greenshot - Screen Recorder

    A free and open source screenshot tool optimized for productivity

    Greenshot is a lightweight screenshot software tool for Windows that quickly creates screenshots of a selected region, window, or full screen; you can even capture complete (scrolling) web pages from Internet Explorer. Greenshot easily annotates, highlights, or obfuscates parts of the screenshot. Greenshot also exports screenshots in various ways: save to file, send to printer, copy to clipboard, attach to e-mail, send Microsoft Office programs, or upload to photo sites like Flickr or Picasa. And Greenshot has a lot more options, to simplify the creation of, and work with, screenshots every day. Overall, Greenshot is easy to understand and configurable, that's why it is an efficient tool for project managers, software developers, technical writers, testers, and anyone else creating screenshots.
    Downloads: 3 This Week
    Last Update:
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  • 17
    Mail Notifier

    Mail Notifier

    Mail Notifer for Windows

    Mail Notifier is free, modern email notifier with the latest user interface trends for Windows 10/11. It supports multiple accounts and IMAP/POP3 protocols. Enjoy customizable notifications, message previews, and more, all in 34 languages! For more details, please refer to the readme.txt file (Files tab, description below). Note: Gmail support is currently unavailable due to verification requirements by Google. Note: Outlook.com support is currently unavailable due to moving to OAuth2 authentication from login/password at Outlook servers.
    Downloads: 18 This Week
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  • 18
    Sumsie
    Easy-to-use editor of Microsoft MSI installer files.
    Downloads: 8 This Week
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  • 19
    It's purpose is to synchronize appointments, tasks and contacts beetween PocketPC and Evolution mail client. It's written in managed C# 2.0.
    Downloads: 6 This Week
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  • 20
    URL Server Manager

    URL Server Manager

    Utility software that unites all programs for server management.

    This software allows you to name, describe and categorize your server. After all previous settings you can assign IP addresses and add either one of the most used protocols or use your own. You can also add additional parameters per address. Once you have your server set up, you can assign a program to a protocol (this program has to support start CMD arguments for an address and a port). Then you can easily go through your servers and open connections from your favorite program with only one click.
    Downloads: 3 This Week
    Last Update:
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  • 21
    AutoLyrix: The open-source lyrics, artwork (AlbumArt) and SyncLyrics searcher. It auto-downloads the lyric/albumart for the song that you are listening! Supported Players: WinAmp,WMPlayer,iTunes,MediaMonkey and more! Visit: http://www.autolyrix.com
    Downloads: 3 This Week
    Last Update:
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  • 22
    Full-featured, fully customizable, multilingual, skinable, multi-document web based WYSIWYG HTML editor control. Microsoft Internet Explorer, Gecko based browsers (Firefox, Netscape, Mozilla) and Opera 9 are supported.
    Downloads: 2 This Week
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  • 23
    Open Cache Manager
    OCM is an easy to use program for managing your geocaches, with the goal of being the Linux equivalent to GSAK. OCM integrates with GPSBabel to support most GPS devices (requires GPSBabel to be installed).
    Downloads: 2 This Week
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  • 24
    Ferda is a user friendly data mining tool. It is a modular distributed multiplatform framework based on Internet Communications Engine. Ferda is very powerful in working with association rules.
    Downloads: 1 This Week
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  • 25
    FileMasta

    FileMasta

    A search application to explore, discover and share online files

    A federated search application for discovering interesting files that are being shared online, such as video, music, books, software, games, subtitles and much more. All data is crawled by od-database which collects information about the contents of servers worldwide. We don't search file contents. We host no content, we provide only access to already available files in the same way Google and other search engines do.
    Downloads: 1 This Week
    Last Update:
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