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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
    Our Free Plans just got better! | Auth0

    With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

    You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
    Try free now
  • 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
    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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  • 3
    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
    Last Update:
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  • 4
    AstroGrep

    AstroGrep

    A Windows File Searching Utility (grep)

    AstroGrep is a Microsoft Windows GUI File Searching (grep) utility. Its features include regular expressions, versatile printing options, stores most recent used paths and has a "context" feature which is very nice for looking at source code.
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    Downloads: 774 This Week
    Last Update:
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  • Collect! is a highly configurable debt collection software Icon
    Collect! is a highly configurable debt collection software

    Everything that matters to debt collection, all in one solution.

    The flexible & scalable debt collection software built to automate your workflow. From startup to enterprise, we have the solution for you.
    Learn More
  • 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
    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
    Last Update:
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  • 7
    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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  • 8
    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
    Last Update:
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  • 9
    PicView

    PicView

    Fast, free and customizable picture viewer

    PicView is a fast, free and fully customizable picture viewer for macOS and Windows 10/11. It supports virtually all image file types, including (animated) WEBP, (animated) GIF, SVG, AVIF, HEIC, PSD and many others. Additional features includes viewing EXIF metadata, image compression, batch resizing, viewing images within archives and comic books, image effects, image galleries, and more. Enjoy a clean, free, and fast experience with no annoying pop-ups, and zero tracking. It works out of the box — or you can customize it to your needs. Available in portable and installable versions.
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    Downloads: 140 This Week
    Last Update:
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  • Incredable is the first DLT-secured platform that allows you to save time, eliminate errors, and ensure your organization is compliant all in one place. Icon
    Incredable is the first DLT-secured platform that allows you to save time, eliminate errors, and ensure your organization is compliant all in one place.

    For healthcare Providers and Facilities

    Incredable streamlines and simplifies the complex process of medical credentialing for hospitals and medical facilities, helping you save valuable time, reduce costs, and minimize risks. With Incredable, you can effortlessly manage all your healthcare providers and their credentials within a single, unified platform. Our state-of-the-art technology ensures top-notch data security, giving you peace of mind.
    Learn More
  • 10
    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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  • 11
    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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  • 12
    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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  • 13
    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
    Last Update:
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  • 14
    Resx Editor is a small translation-oriented file editor for Microsoft RESX 2.0 files. Resx Editor is designed for professional translators (include a word count feature).
    Downloads: 1 This Week
    Last Update:
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  • 15
    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
    Last Update:
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  • 16
    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
    Last Update:
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  • 17

    TheAirline

    We have moved to GitHub! github.com/TheAirlineProject

    http://theairlineproject.net/forum/ http://facebook.com/TheAirline http://twitter.com/pjank42
    Downloads: 1 This Week
    Last Update:
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  • 18
    A control (for ASP.NET 3.5 and above) that can replace the old asp:FileUpload control (possibly without changing the code behind). Complete styling of the upload button with HTML and CSS. It can be put inside an asp:UpdatePanel!
    Downloads: 0 This Week
    Last Update:
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  • 19
    An Open Source drinking game -- perfect for parties! The game will randomly pick out persons to drink random amounts and can include simple math problems! Go to the detailed description to read more!
    Downloads: 0 This Week
    Last Update:
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  • 20
    Educational Business Administration System A program used to administrate students, their courses and grades. The application is non-webbased and it is made with C++ and ATL. MSDE is currently the database that is used, when storing data.
    Downloads: 0 This Week
    Last Update:
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  • 21
    Evolutility - CRUD framework for ASP.net

    Evolutility - CRUD framework for ASP.net

    CRUD framework with a generic Web UI and integrated micro ORM.

    Evolutility is a lightweight CRUD framework for heavy lifting. With a generic Web UI and an integrated micro ORM, Evolutility provides a framework for full CRUD and dashboard without any hand-coding. With it, you can build CRUD web applications or professional looking administration pages by defining metadata in XML (or in a database) instead of hand-coding HTML, Javascript, CSS, SQL, and C# or VB. For ASP.NET and SQLServer (partial support for MySQL).
    Downloads: 0 This Week
    Last Update:
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  • 22

    Fekke's BMI calculator

    C# BMI Calculator with wizzard.

    An application written in C#, which will assist you in calculating your Body Mass Index.
    Downloads: 0 This Week
    Last Update:
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  • 23
    A fork of pidgin which aims to provide minor features that have not been addressed by the pidgin development team (including manual textbox resizing). See funpidgin.sf.net for details.
    Downloads: 0 This Week
    Last Update:
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  • 24
    This is a small asp.net web site for estimating projects based on past experiences with estimates. This is inspired by Evidence Based Scheduling (http://www.joelonsoftware.com/items/2007/10/26.html).
    Downloads: 0 This Week
    Last Update:
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  • 25
    Lan# SearchEr is a program made in C# .NET it findes all computers, FTP server, HTTP server and lists all win shares on the LAN
    Downloads: 0 This Week
    Last Update:
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