Browse free open source C# Libraries and projects below. Use the toggles on the left to filter open source C# Libraries by OS, license, language, programming language, and project status.

  • 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.
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  • Skillfully - The future of skills based hiring Icon
    Skillfully - The future of skills based hiring

    Realistic Workplace Simulations that Show Applicant Skills in Action

    Skillfully transforms hiring through AI-powered skill simulations that show you how candidates actually perform before you hire them. Our platform helps companies cut through AI-generated resumes and rehearsed interviews by validating real capabilities in action. Through dynamic job specific simulations and skill-based assessments, companies like Bloomberg and McKinsey have cut screening time by 50% while dramatically improving hire quality.
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  • 1
    CSharp MARC

    CSharp MARC

    Full featured editor for reading and manipulating MARC Records

    *** THIS PROJECT HAS MOVED TO GITHUB *** https://github.com/frozen-solid/CSharp_MARC/ ********************************************************** C# MARC: C# class structures for reading and manipulating Library of Congress MARC records using the MARC21 standard. Based upon the PHP Pear package File_MARC (http://pear.php.net/package/File_MARC) by Dan Scott. C# MARC Editor: A full featured SQLite based editor for quickly modifying MARC records and exporting them to MARC21 or MARCXML.
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  • 2

    C_Sharp_Calculator

    RPN based calculator in C#.

    Currently, this is the first version of an RPN calculator made to be easy to implement for any C# project requiring parsing of text into calculable data. Using RPN (Reverse Polish Notation) to place strings in a specific format to allow fast processing for parsing and evaluating the string.
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  • 3

    Cairo#

    Mono.Cairo library updated to cairo version 1.12.

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  • 4

    Calcex Math Parser

    Mathematical expression parser and evaluator for .NET

    Moved to https://github.com/alxnull/calcex Calcex is a simple math parser for .NET to evaluate mathematical expressions which is developed in C#. It supports many common mathematical operations and functions and allows the user to add custom functions and variables. It is possible to evaluate double or decimal values for high precision. Calcex also includes functions for converting numbers from decimal to binary or other bases. The project includes a simple calculator and decimal-binary converter to show the functions of Calcex.
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  • Turn traffic into pipeline and prospects into customers Icon
    Turn traffic into pipeline and prospects into customers

    For account executives and sales engineers looking for a solution to manage their insights and sales data

    Docket is an AI-powered sales enablement platform designed to unify go-to-market (GTM) data through its proprietary Sales Knowledge Lake™ and activate it with intelligent AI agents. The platform helps marketing teams increase pipeline generation by 15% by engaging website visitors in human-like conversations and qualifying leads. For sales teams, Docket improves seller efficiency by 33% by providing instant product knowledge, retrieving collateral, and creating personalized documents. Built for GTM teams, Docket integrates with over 100 tools across the revenue tech stack and offers enterprise-grade security with SOC 2 Type II, GDPR, and ISO 27001 compliance. Customers report improved win rates, shorter sales cycles, and dramatically reduced response times. Docket’s scalable, accurate, and fast AI agents deliver reliable answers with confidence scores, empowering teams to close deals faster.
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  • 5
    Some stuff for use with Silverlight & WPF: Mostly related to MVVM and WCF RIA Services. This library is *not* being actively developed anymore. In my spare time, I'm still developing further on the WPF side, because of a project I started 2008/2010. But I rarely push my updates to this Lib.
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  • 6
    Catharsis.NET.Commons

    Catharsis.NET.Commons

    Library of extensions for many common .NET types.

    Catharsis.NET.Commons is a library of extensions for many common .NET types. It can significantly speedup your daily .NET development tasks, relieving you of writing boilerplate code time and again. Do more by writing less code; write less code using a popular fluent-kind interface approach; safely perform many tasks in a single line of code with joined methods calls. This library is extensively unit-tested, greatly reducing the possibility of bugs and quirks. Purpose : Provide extension methods for common .NET types and common domain classes to simplify and speedup typical .NET business applications development process. Target : .NET Framework 3.5/3.5 Client Profile/4.0/Silverlight 5 NuGet package : https://www.nuget.org/packages/Catharsis.Commons
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  • 7
    Catharsis.NET.Domain

    Catharsis.NET.Domain

    .NET library which provides commonly used types of domain entities.

    Catharsis.NET.Domain is a .NET library which provides commonly used types of domain entities (like Article,Blog, Comment, Download, Faq, etc.) to speed up development of domain layer in many typical business applications. This library includes the following: 1. Domain entity types, declared as partial classes (can be extended if necessary). 2. Set of common domain-related interfaces, like INameable and ITaggable. 3. Set of extension methods for IEnumerable/IQueryable sets of domain entities. The following types of domain entities are provided: Announcement/Announcements Category Art/Arts Album Article/Articles Category Audio/Audios Category Blog/Blog Entry City/Country/Location Comment Download/Downloads Category FAQ Notification Person Playcast/Playcasts Category Profile Setting Song/Songs Album Subscription Text/Texts Category Video/Videos Category Web Link/Web Links Category NuGet package : https://www.nuget.org/packages/Catharsis.Domain
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  • 8
    Catharsis.NET.Repository

    Catharsis.NET.Repository

    .NET library that provides abstraction over persistent data storages.

    Catharsis.Repository .NET library provides abstraction over persistent data storages by introducing commonrepository pattern interfaces over popular ORM frameworks (NHibernate, Entity Framework, LINQ2SQL), as well as their implementations. Target : .NET Framework 4.0 NuGet package : https://www.nuget.org/packages/Catharsis.Repository The following ORM frameworks are supported at this time : 1. NHibernate 2. Entity Framework 6 (Database-First/Code-First approaches) 3. LINQ to SQL
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  • 9
    Catharsis.Social Web Widgets

    Catharsis.Social Web Widgets

    Useful social media widgets to include on web pages of your site.

    Catharsis Social Web Widgets is a modern software library which provides useful social media widgets to include on web pages of your site. It comes adapted for several popular web frameworks and technologies: 1. ASP.NET MVC (https://github.com/prokhor-ozornin/Catharsis.NET.Web.Widgets) 2. Grails (https://github.com/prokhor-ozornin/Catharsis.Grails.Widgets) As of the latest version, the following areas are covered : 1. Cackle 2. Disqus 3. Facebook 4. Google 5. IntenseDebate 6. Mail.ru 7. RuTube 8. Surfingbird 9. Tumblr 10. Twitter 11. Vimeo 12. VKontakte 13. Yandex 14. YouTube 15. VideoJS
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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.
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  • 10
    Cecil

    Cecil

    Cecil is a library to inspect, modify and create .NET programs

    Cecil is a library to inspect, modify and create .NET programs and libraries. Mono.Cecil is a library to generate and inspect programs and libraries in the ECMA CIL form. Analyze .NET binaries using a simple and powerful object model, without having to load assemblies to use Reflection. Modify .NET binaries, add new metadata structures and alter the IL code. Cecil has been around since 2004 and is widely used in the .NET community. If you're using Cecil, or depend on a framework, project, or product using it, please consider sponsoring Cecil. Cecil 0.10 beta 5 addresses a long standing issue: previously, a rewrite of native pdb files would lose some debugging information, including the list of namespaces that were used in methods (and thus breaking the expression evaluation) or the scopes in generators (for iterators or async methods).
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  • 11
    This project is a set of two libraries that allow one to include in one's project all that is needed to create a character, including (but not limited to) user controls, random name generators, weight/height algorithms...
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  • 12

    ChecksumValidation

    Validation of IBANs, bank accounts, credit cards, identity cards

    ChecksumValidation is a framework for validation of international bank accounts (IBAN), credit card numbers, german identity cards, german passports and for german bank accounts. Validation is performed by computing checksums. Checksums for german bank accounts are maintained and documented by www.bundesbank.de. In sum, ChecksumValidation implements round about 150 algorithms. It may freely be used under GNU GPLv3 licence (see below). ChecksumValidation is implemented in Microsoft .NET 2.0. It consists of: - ChecksumValidation: a class library (DLL) for in-process use - ChecksumSoapServer: a SOAP interface - ChecksumTcpServer: a TCP interface implementing a domain-specific language (DSL) for validation - ChecksumComServer: a COM interface - ChecksumClient: a test utility - ChecksumUnitTest: a 100% covering NUnit test - ChecksumUtility: a command-line tool for helper functions
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  • 13
    Chloe

    Chloe

    A lightweight and high-performance Object/Relational Mapping(ORM)

    Chloe is a lightweight Object/Relational Mapping(ORM) library. The query interface is similar to LINQ. You can query data like LINQ and do any things(Join Query | Group Query | Aggregate Query | Insert | Batch Update | Batch Delete) by lambda with Chloe.ORM. Pay attention to splicing lambda expression trees by yourself, do not wrap your variables with ConstantExpression, otherwise, non-parameterized sql will be generated, and there is a risk of sql injection! If the entity does not explicitly specify any auto-increment columns and the primary key is of type Int16, Int32, or Int64, the default primary key is the auto-increment column. If it is not an auto-increment column, it needs to be marked with the attribute NonAutoIncrementAttribute.
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  • 14
    CliWrap

    CliWrap

    Library for interacting with command-line interfaces

    CliWrap is a .NET library that provides a high-level, fluent interface for launching and managing external command-line processes in a safe and asynchronous manner. It abstracts the complexity of the native process APIs by offering a composable model for configuring commands, arguments, working directories, and stream redirection. The library emphasizes reliability and developer ergonomics, including built-in support for piping, cancellation handling, and deadlock avoidance. CliWrap is fully asynchronous and designed with immutability principles, making it well suited for modern concurrent applications. It also includes flexible mechanisms for capturing standard output and error streams, enabling advanced automation scenarios. Overall, CliWrap simplifies process orchestration in .NET applications while maintaining strong safety and performance guarantees.
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  • 15
    CloudTierSDK

    CloudTierSDK

    CloudTier Storage Tiering SDK

    The CloudTier Storage Tiering SDK is a Hierarchical Storage Management (HSM) file system filter driver development kit. It implements a data storage strategy that automatically migrates data between high-cost and low-cost storage media, optimizing storage efficiency and reducing both capital and operational expenses. This SDK offers a simple and cost-effective solution to seamlessly integrate your on-premises storage infrastructure with cloud storage. The migration of files to the cloud happens transparently and securely, with no disruption to existing applications or infrastructure. The SDK uses on-premises storage as Tier 0 (hot storage) and cloud storage as Tier 1 (cold storage). Cooler or less frequently accessed data is automatically moved to cloud storage, freeing up local storage capacity. Your applications can continue to access all files as if they reside locally—no changes to your code or workflow are required.
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  • 16
    Code7248.word_reader

    Code7248.word_reader

    A C# .NET Library for reading Word Documents (doc and docx)

    A simple .NET Library compatible with .NET 2.0, 3.0, 3.5 and 4.0. It can currently extract only the raw text from a .doc or .docx file. Use a RichTextBox instead of a normal TextBox to retain formatting, if you want to display it in your form.
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  • 17
    Common Litt

    Common Litt

    Simple java script library for auto literation, input tool.

    This project focuses of auto conversion in between language alphabets. Using this 'lit.js' library currently you can done conversion in between English - Tamil - Sinhala scrpits vise-versa. This is use full when you need to know how write something in an other given language. This is still at development stage but works purfectly and easy to customize as well. Live demo available at: http://commonlitt.42web.io/ For UI creations I had used Bootstrap and Jquery. For easy array creation using the text based dictionaries, I had used a c sharp program 'LangSeperator' . That is also available here.
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  • 18
    The ComponentLib library contains classes and controls used by other my projects: VocabularyTest (sourceforge.net/projects/vocabulary-test); HomeCollection (sourceforge.net/projects/homecollection)
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  • 19
    ComputeSharp

    ComputeSharp

    .NET library to run C# code in parallel on the GPU through DX12

    ComputeSharp is a .NET library to run C# code in parallel on the GPU through DX12 and dynamically generated HLSL compute shaders. The available APIs let you access GPU devices, allocate GPU buffers and textures, move data between them and the RAM, write compute shaders entirely in C# and have them run on the GPU. The goal of this project is to make GPU computing easy to use for all .NET developers! You can use this library to create all sorts of things from scientific simulations, to animated backgrounds, audio visualizers and more! The sample app is available in the Microsoft Store, showcasing several pixel shaders all powered by ComputeSharp! In order to also build and run all UWP and WinUI 3 projects, these components need to be installed, UWP development workload, Windows 10 SDKs 17763 and 19041, and Windows App SDK extension for VS2022.
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  • 20
    ConsoleFx Commandline Processing Library

    ConsoleFx Commandline Processing Library

    Command-line application library

    ConsoleFx is an .NET framework for easily developing command-line interface (CLI) applications. It automates most of the work involved in creating a CLI application, like command line argument parsing, error handling and validations. ConsoleFx supports both fluent and declarative (using attributes) programming models. With ConsoleFx, you can say goodbye to lengthy cumbersome code to parse your command-line arguments. For detailed documentation, with getting started guides, advanced topics and references, please visit: https://github.com/JeevanJames/ConsoleFx
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  • 21

    ControlAnimations

    Library for Windows Forms that provides basic animations like WPF.

    (Published under MIT license, see source for details) ControlAnimations is an easy-to-use library for .NET Windows Forms that allows you to give any Control an animation for any property. It's flexible and easy-to-use, it uses cubic ease in-out interpolation for very smooth transitions. You can transition any property of any Control (panels, buttons, textboxes) either in color or in value. HOW TO USE After importing Digaly.ControlAnimations, you use it as follows: 1. Define a global variable in the Form class that will hold the animations: (C#) Animator anims = new Animator(); 2. In Form load (you could also do it elsewhere), add the animations: anims.Add("myanimation", panel1.MakeAnimation("Width", 100)); 3. Play the animation, for example in panel1.clicked event: anims.Toggle("myanimation") Your panel is now animated! Have fun! If you have any problems/concerns, please contact me.
    Downloads: 0 This Week
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  • 22
    CoreTweet

    CoreTweet

    A .NET Twitter Library

    Simple, Powerful, and Well-designed for LINQ We recommend using NuGet to install this library. https://www.nuget.org/packages/CoreTweet
    Downloads: 0 This Week
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  • 23
    Coronis SDK

    Coronis SDK

    Set of module for data processing of wireless device

    The goal is to create a leading “Set of software libraries for data processing of wireless device based on Coronis platform“. These libraries will run on all major platforms (embedded and desktop) and provide services for data processing through generic APIs. Keywords: Coronis, Wavenis, API, Plugin, Wireless, Waveport, Wavecard, Profile, Java, C, C++, C#
    Downloads: 0 This Week
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  • 24
    A cron expression parser.
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  • 25
    A full featured, object-oriented, multi-platform C# wrapper for the curses terminal control library.
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