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.

  • Go From AI Idea to AI App Fast Icon
    Go From AI Idea to AI App Fast

    One platform to build, fine-tune, and deploy ML models. No MLOps team required.

    Access Gemini 3 and 200+ models. Build chatbots, agents, or custom models with built-in monitoring and scaling.
    Try Free
  • Full-stack observability with actually useful AI | Grafana Cloud Icon
    Full-stack observability with actually useful AI | Grafana Cloud

    Our generous forever free tier includes the full platform, including the AI Assistant, for 3 users with 10k metrics, 50GB logs, and 50GB traces.

    Built on open standards like Prometheus and OpenTelemetry, Grafana Cloud includes Kubernetes Monitoring, Application Observability, Incident Response, plus the AI-powered Grafana Assistant. Get started with our generous free tier today.
    Create free account
  • 1

    OpenGL4Net

    Simple OpenGL 4.3 wrapper for .NET platform

    Feb. 2014: The project is still active; a new version with many changes is comming soon! NOTE: The Khronos group made a big shift in describing the OpenGL specification. Starting from OpenGL 4.4, the old .spec files are replaced by .xml which is great news for community, bad news for me and this project as it strongly depends on the old format. Currently I am working on the new version, but there's really a huge change, so please, be patient. I'd also would like to make the licensing clear (probably BSD). OpenGL4Net is a simple wrapper of OpenGL 4.3 for .NET platform. The main idea of the library is to keep the syntax as close as possible to the C style and on the other hand, provide some overloaded functions that simplifies the development of .NET application. The library also contains some helper classes to make a development really fast (e.g., class RenderContext for opening the OpenGL context; or class Program for loading, compiling and linking shaders)
    Leader badge
    Downloads: 6 This Week
    Last Update:
    See Project
  • 2
    jni4net

    jni4net

    Fast, object oriented, intraprocess bridge between JVM and CLR

    Fast, object oriented, intraprocess bridge between JVM and CLR
    Downloads: 10 This Week
    Last Update:
    See Project
  • 3
    APTools
    APTools (Accelerate Programming Tools) is a .NET libraries that aim to provide common needed objects and functions and therefore accelerate programming. Its brings immutable collections, parameter validation, design patterns interfaces and more.
    Downloads: 8 This Week
    Last Update:
    See Project
  • 4

    Rpg.NET

    Performance enhancement API for RPG Maker XP, VX, VXA.

    Rpg.NET is an API built using the .NET Framework for both improving performance and enhancing the RPG Maker series (XP, VX, and VXA). Contained within are various functions and classes that extend the ability of RPG Maker in areas such as graphics, audio, and Windows API interop. Included is a Ruby script that is the wrapper around the library, so it can be used as any other script within your game.
    Downloads: 6 This Week
    Last Update:
    See Project
  • MongoDB Atlas runs apps anywhere Icon
    MongoDB Atlas runs apps anywhere

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

    MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
    Start Free
  • 5
    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.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 6
    NestProfessor Programmer Edition
    This is a SDK which can nest/layout the part/geometry/polygon on the material or sheet intelligently, you can get the best utilization of the materials, this SDK also support read/write DXF/DWG files and part-in-part nesting. New nesting lagorithm is implenmented, more good to support true shape part or material.
    Leader badge
    Downloads: 3 This Week
    Last Update:
    See Project
  • 7

    ULS

    A lexical analyzer generator that makes the class source code.

    ULS is a class library for creating lexical analyzer from language specification file. It's provided as C/C++/C# and Java (class) libraries with a few of tools on Linux/Windows platform.
    Downloads: 5 This Week
    Last Update:
    See Project
  • 8
    Formerly known as DotNetOpenId, this library brings easy and flexible OpenID, OAuth and InfoCard to the .NET platform. Official web site is at http://www.dotnetopenauth.net/, which includes source code downloads.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 9
    sharpPDF is easy-to-use c# library to generate PDF on the fly. It allows to save pdf files or get binary streams in output(for example, usable in ASP.NET).
    Downloads: 2 This Week
    Last Update:
    See Project
  • Try Google Cloud Risk-Free With $300 in Credit Icon
    Try Google Cloud Risk-Free With $300 in Credit

    No hidden charges. No surprise bills. Cancel anytime.

    Use your credit across every product. Compute, storage, AI, analytics. When it runs out, 20+ products stay free. You only pay when you choose to.
    Start Free
  • 10
    DSP Lab

    DSP Lab

    Digital Signal Processing Simulation

    DSP Lab is a digital signal processing simulation application created to simulate and visualize process of sampling and filtering analog signal using DSP system. This application is created to provide as a tool for educator and student to visualize and understand DSP system. Source code is available at https://payhip.com/b/9mPY
    Downloads: 3 This Week
    Last Update:
    See Project
  • 11
    HTML++

    HTML++

    Object-oriented generation of HTML code on .NET 4 Client Profile

    This library allows you to generate HTML pages directly from your code in a strongly typed, compositional, safe and concise manner. Requires the .NET Framework 4 Client Profile only. It is licensed under LGPL, which means that you may use it in commercial products. The project logo is from Mariano Real, who kindly provided it under a Creative-Commons license.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 12
    veha
    Information terminal for public use Информационная стойка для посетителей
    Downloads: 3 This Week
    Last Update:
    See Project
  • 13
    .Net Runtime Library for Delphi

    .Net Runtime Library for Delphi

    This is the best library to work with the .Net framework from Delphi.

    The .Net Runtime Library for Delphi (CNClrLibrary) is the best library to work with .Net framework and .Net libraries from Delphi. It is designed to provide a way to interact with applications written in anyone of the .Net languages (such as C#, Visual Basic.Net, Delphi.Net, JScript.Net, etc) from Delphi. CNClrLibrary allows Delphi to use .Net libraries without the need for registry entries, COM registrations, or changes to the .NET libraries. Competitive Advantages: - No extra dll is required when deployed. - No COM registration of .Net Libraries is required when deployed. - There are tools to generate your .Net Libraries into Delphi pas files. - Allows Delphi to consume .Net libraries as if they were native code. - Full access to .Net Framework Class Library. - Easy to use. CNClrLibrary can do so much: - Access .Net Framework Class Library. - Access Third Party .Net Libraries. - Access Your .Net Libraries. - etc Latest Version: 6.0.7.0
    Leader badge
    Downloads: 2 This Week
    Last Update:
    See Project
  • 14
    EasyNetVars

    EasyNetVars

    Data Exchange between CoDeSys Devices and .NET via Network Variables

    Library (.DLL) for Data Exchange between CoDeSys Devices and .NET and Step 7 via Network-Variables written in C# V1.0: Bugfixes New 02/2015: Read and Write Operations possible for more than 255 byte. - Read and Write Operations CoDeSys -> .NET - Method to create .GVL-File to import in CoDeSys Example in Step 7 (TIA-Portal) for Data-exchange between CoDeSys and Siemens S7 Devices CoDeSys -> Step7 (S7-1200): https://sourceforge.net/projects/easynetvars/files/NetVarsStep7/ See WIKI and Implementation-Guide for more information
    Downloads: 2 This Week
    Last Update:
    See Project
  • 15
    NPlot is an open source charting library for .NET. It boasts an elegant and flexible API. NPlot includes controls for Windows.Forms, ASP.NET and a class for creating Bitmaps. A GTK# control is also available.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 16
    Neural Libs

    Neural Libs

    Neural network library for developers

    This project includes the implementation of a neural network MLP, RBF, SOM and Hopfield networks in several popular programming languages. The project also includes examples of the use of neural networks as function approximation and time series prediction. Includes a special program makes it easy to test neural network based on training data and the optimization of the network.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 17
    Space3d

    Space3d

    C# graphics library used for 3D modeling, built with OpenGL/OpenTK

    The Graphics Library is built on top of OpenTK, the C# library that wraps OpenGL. The intended clients are technical and engineering graphics applications that require three-dimensional visualization tool. The implementation draws a scene on separate working thread, optionally, the thread-updater may be invoked. The Space3d Library uses Recursive Composition design pattern. The hierarchy by reference, built into the component, plays a dual role in modeling three-dimensional space: first, it provides a control over a lifetime of the object cluster; second, it mirrors a subordination of the object coordinate systems. The project libraries are built with Visual Studio, using .NET Framework 4.7.1. To test the graphics capabilities, compile and run the GraphicsTest solution. To test the Space3d Library, compile and run the Space3dTest solution.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 18

    .Net VCL for Delphi

    Comprehensive library of .Net UI Controls and components for Delphi.

    The .Net Visual Component Library (VCL) for Delph is the most comprehensive Library of .Net WinForms UI Controls and components for Delphi. Includes over 50 essential .Net UI controls and components which are available in Delphi such as Active Directory components, Internet components, printing components, Xml components, Dialog components, UI controls, Grid controls, and many more for building powerful line-of-business Windows applications in Delphi. Built on solid .Net Framework and advanced .Net functionalities, .Net VCL for Delphi provides innovative and advanced quality UI controls and components for Delphi that let you build powerful business desktop application effortless in timely fashion. Tightly integrated with Embarcadero Delphi, you can use all features available in the Embarcadero Delphi IDE for your development tools and start working with UI instantly. The .Net VCL for Delphi consists of: - .Net Component Suite for Delphi - .Net Control Suite for Delphi
    Downloads: 1 This Week
    Last Update:
    See Project
  • 19
    Contains a base class AsynchronousOperation which allows you to start long-running operations on a separate thread from the UI whilst providing meaningful progress information to the UI without the UI needing to know anything about the internal implementation of the operation being run.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 20
    Image Compare

    Image Compare

    The tool to find duplicate images at different resolutions.

    The goal of this project is to compare two images at different resolutions and determine if they are the same image. Just point the tool at a directory and press SCAN. The tool will find all the duplicates that match your settings. The default is anything over 90%.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 21
    Use KeySter to create a fake keygen/crack for your application. The fake crack will help the user to send an email to authorities, in which the user will confess of stealing software and then ask to be arrested :-)
    Downloads: 1 This Week
    Last Update:
    See Project
  • 22
    A small DirectInput wrapper for XNA 3.1, which allows you to use old Xbox controllers just as easily as the 360 GamePads.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 23

    OracleClientDAC for Delphi

    A feature-rich and high-performance data access components for Oracle

    OracleClient Data Access Components (OracleClientDAC) is a feature-rich and high-performance library of components that provides native connectivity to Oracle from Delphi. OracleClientDAC-based applications connect to Oracle directly through the ADO.Net OracleClient, which is an Oracle Data Provider for .NET (ODP.Net). OracleClientDAC aims to assist programmers in developing of fast and native Oracle database applications. OracleClientDAC allows developers to take advantage of advanced Oracle database functionality, including Real Application Clusters, self-tuning statement cache, and fast connection failover. OracleClientDAC, a high-performance and feature-rich Oracle connectivity solution, is an efficient native alternative to the Borland Database Engine (BDE) and standard dbExpress driver. It provides both possibility of connection to Oracle by means of native Oracle data access and direct access to Oracle without Oracle Client.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 24
    Console and library-based windows app for tagging of media files. Supports adding full tags, MusicBrainz tagging, and music fingerprinting.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 25
    TWAIN for C-Sharp (C#)

    TWAIN for C-Sharp (C#)

    A C# interface for TWAIN

    [Important] The project moved to GitHub. Please use the following GitHub project page from now on: https://github.com/twain/twain-cs A C# interface for the TWAIN image capture API, that also includes a toolkit layer, a diagnostic application and a sample application.
    Downloads: 1 This Week
    Last Update:
    See Project
MongoDB Logo MongoDB