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

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  • 1
    .NET

    .NET

    This repo is the official home of .NET on GitHub

    This repository is the home of the .NET platform’s source, infrastructure, and ecosystem coordination. It serves as a “virtual monolithic repo” that aggregates the components (runtime, SDK, libraries, tools) needed to build the .NET SDK and platform. It is a central launching point for understanding, contributing to, or navigating .NET’s many open source subprojects and documentation. Contains policies, guidelines, documentation, and meta-project glue. Synchronization of subprojects into a unified view (Virtual Monolithic Repository). Issue triaging, contribution workflows, and governance linking across subrepos. Acts as an entrypoint/road map for .NET’s broad open source ecosystem.
    Downloads: 7 This Week
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  • 2
    Zenject

    Zenject

    Dependency Injection Framework for Unity3D

    Zenject is a lightweight highly performant dependency injection framework built specifically to target Unity 3D (however it can be used outside of Unity as well). It can be used to turn your application into a collection of loosely-coupled parts with highly segmented responsibilities. Zenject can then glue the parts together in many different configurations to allow you to easily write, reuse, refactor, and test your code in a scalable and extremely flexible way. Injection across different Unity scenes to pass information from one scene to the next. Scene parenting, allows one scene to inherit the bindings from another. Support for global, project-wide bindings to add dependencies for all scenes. Convention based binding, based on class name, namespace, or any other criteria. Ability to validate object graphs at editor time (including dynamic object graphs created via factories). Automatic binding on components in the scene using the ZenjectBinding component.
    Downloads: 7 This Week
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  • 3
    IKVM.NET is a JVM for the Microsoft .NET Framework and Mono. It can both dynamically run Java classes and can be used to convert Java jars into .NET assemblies. It also includes a port of the OpenJDK class libraries to .NET.
    Downloads: 27 This Week
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  • 4
    .NET Multi-platform App UI

    .NET Multi-platform App UI

    .NET MAUI is the .NET Multi-platform App UI

    .NET Multi-platform App UI (.NET MAUI) is a cross-platform framework for creating mobile and desktop apps with C# and XAML. Using .NET MAUI, you can develop apps that can run on Android, iOS, iPadOS, macOS, and Windows from a single shared codebase. .NET Multi-platform App UI (.NET MAUI) is the evolution of Xamarin.Forms that expands capabilities beyond mobile Android and iOS into desktop apps for Windows and macOS. With .NET MAUI, you can build apps that perform great for any device that runs Windows, macOS, Android, & iOS from a single codebase. Coupled with Visual Studio productivity tools and emulators, .NET and Visual Studio significantly speed up the development process for building apps that target the widest possible set of devices. Use a single development stack that supports the best of breed solutions for all modern workloads with a unified SDK, base class libraries, and toolchain.
    Downloads: 6 This Week
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  • 5
    Avalonia

    Avalonia

    A cross-platform UI framework for .NET

    Avalonia is a cross-platform UI framework for dotnet, providing a flexible styling system and supporting a wide range of Operating Systems such as Windows, Linux, macOS. Avalonia is mature and production-ready. We also have in beta release support for iOS, Android and in early stages support for browsers via WASM. Avalonia is open source, free to use, and always will be. Clone the source today to dig deeper. The free VS extension provides everything needed to start, including a XAML previewer. JetBrains deep understanding of Avalonia shines through with rich Rider and R# support. Deploy to the platforms you care about with ease. Leverage existing knowledge, code and packages to kickstart your project. Get the support your project needs with one of our commercial support agreements. Help you can count on. JetBrains delivers huge productivity gains for Avalonia developers.
    Downloads: 6 This Week
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  • 6
    CSCore

    CSCore

    An advanced audio library, written in C#. Provides tons of features

    An advanced audio library, written in C#. Provides tons of features. From playing/recording audio to decoding/encoding audio streams/files to processing audio data in real-time (e.g. applying custom effects during playback, creating visualizations). The possibilities are nearly unlimited. CSCore is a free .NET audio library which is completely written in C#. Although it is still a rather young project, it offers tons of features like playing or capturing audio, en- or decoding many different codecs, effects and much more! CSCore is based on a very extensible architecture that allows you to make it fit to your needs without any major effort. You can build music players, voice chats, audio recorders and so on! Supported platforms, Windows only, Linux and mac experimental. Optimized performance though the usage of CLI instructions provided by a custom post compiler.
    Downloads: 6 This Week
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  • 7
    Cofoundry

    Cofoundry

    Cofoundry is an extensible and flexible .NET Core CMS

    Cofoundry is an unobtrusive ASP.NET Core CMS focused on code-first development and user-friendly content management. Run integrated, decoupled or headless, it's your choice. Cofoundry is there when you want it and gets out of your way when you don't. Get back to writing regular .NET code you love and enjoy complete freedom with your front-end technology and designs. We understand that every application is different. Cofoundry is an adaptable framework that let's you swap in your preferred tools and scale up your architecture when you need it. DI is at the heart of Cofoundry which makes it really easy to override any implementation. Plugins are easily installed via Nuget, but it’s also simple to inject your own custom implementation. CMS administration interfaces are often built to serve both developers and content editors which leads them to be complicated and full of jargon.
    Downloads: 6 This Week
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  • 8
    Mono

    Mono

    Mono open source ECMA CLI, C# and .NET implementation

    Mono is an open‑source implementation of Microsoft's .NET Framework (ECMA‑compatible), enabling developers to build cross‑platform applications. Supported by the .NET Foundation, Mono allows .NET code to run across different operating systems. You can run the mono and mcs test suites with the command; make check. You can verify your installation by using the mono-test-install script, it can diagnose some common problems with Mono's install. Failure to follow these steps may result in a broken installation. The Mono Project (mono/mono) (‘original mono’) has been an important part of the .NET ecosystem since it was launched in 2001. Microsoft became the steward of the Mono Project when it acquired Xamarin in 2016.
    Downloads: 6 This Week
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  • 9
    Seal Report

    Seal Report

    Database Reporting Tool and Tasks (.Net)

    Seal Report is an open-source tool for the generation of daily reports from any database. It offers a complete framework for producing dynamic reports and dashboards, with a focus on simplicity and ease of use.
    Downloads: 6 This Week
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  • 10
    SkiaSharp

    SkiaSharp

    SkiaSharp is a cross-platform 2D graphics API for .NET platforms

    SkiaSharp is a cross-platform 2D graphics API for .NET platforms based on Google's Skia Graphics Library. It provides a comprehensive 2D API that can be used across mobile, server and desktop models to render images. Building SkiaSharp is mostly straight forward. The main issue is the multiple dependencies for each platform. However, these are easy to install as they are found on the various websites. If you are just working on managed code, it is even easier as there mays to skip all the native builds. Because there are multiple distros of Linux, and we cannot possibly support them all, we have a separate NuGet package that will contain the supported binaries for a few distros.
    Downloads: 6 This Week
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  • 11
    reko

    reko

    Reko is a binary decompiler

    Reko (Swedish: "decent, obliging") is a decompiler for machine code binaries. This project is freely available under the GNU General Public License. The project consists of front ends, core decompiler engine, and back ends to help it achieve its goals. A command line, a Windows GUI, and a ASP.NET front end exist at the time of writing. The decompiler engine receives inputs from the front ends in the form of either individual executable files or decompiler project files. Reko project files contain additional information about a binary file, helpful to the decompilation process or for formatting the output. The decompiler engine then proceeds to analyze the input binary. Reko has the ambition of supporting decompilation of various processor architectures and executable file formats with minimal user intervention. For a complete list, see the supported binaries page.
    Downloads: 6 This Week
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  • 12
    FFME

    FFME

    FFME: The Advanced WPF MediaElement (based on FFmpeg)

    FFME: The Advanced WPF MediaElement (based on FFmpeg). FFME is an advanced and close drop-in replacement for Microsoft's WPF MediaElement Control. While the standard MediaElement uses DirectX (DirectShow) for media playback, FFME uses FFmpeg to read and decode audio and video. This means that for those of you who want to support stuff like HLS playback, or just don't want to go through the hassle of installing codecs on client machines, using FFME might just be the answer. Fast media seeking and frame-by-frame seeking. Properties such as Position, Balance, SpeedRatio, IsMuted, and Volume are all Dependency Properties. Additional and extended media events. Extracting (and modifying) video, audio and subtitle frames is very easy. Easily apply FFmpeg video and audio filtergraphs. Extract media metadata and specs of a media stream (title, album, bit rate, codecs, FPS, etc). Apply volume, balance and speed ratio to media playback. MediaState actually works on this control.
    Downloads: 5 This Week
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  • 13
    MoreLINQ

    MoreLINQ

    Extensions to LINQ to Objects

    MoreLINQ can be used in one of two ways. The simplest is to just import the MoreLinq namespace and all extension methods become instantly available for you to use on the types they extend (typically some instantiation of IEnumerable<T>). In some very rare instances, however, doing so can cause conflicts with other libraries you may be using that incidentally also extend the same type with an identically named method and signature. This happened with MoreLINQ, for example, when Microsoft .NET Framework 4.0 introduced Zip and MoreLINQ already had one. Starting with version 3.0 of MoreLINQ, you can reduce the potential for present (or even future) conflicts by individually importing just the extension methods you need using the static imports feature introduced in C# 6. Building the documentation is supported on Windows only and requires Sandcastle Help File Builder (SHFB). Executing builddocs.cmd generates the documentation in the docs/api directory.
    Downloads: 5 This Week
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  • 14
    MvvmCross

    MvvmCross

    The .NET MVVM framework for cross-platform solutions

    Build clean, pixel perfect, native UIs. Share behavior and business logic in a single codebase across supported platforms, using the Model-View-ViewModel (MVVM) design pattern. MvvmCross is a framework specifically developed for Xamarin and the mobile ecosystem. It supports Xamarin.iOS, Xamarin.Android, Xamarin.Mac, Xamarin.Forms, Universal Windows Platform (UWP) and Windows Presentation Framework (WPF). MvvmCross is a cross-platform MVVM framework. It enables developers to create apps using the MVVM pattern on Xamarin.iOS, Xamarin.Android, Xamarin.Mac, Xamarin.Forms, Universal Windows Platform (UWP) and Windows Presentation Framework (WPF). This allows for better code sharing by allowing you to share behavior and business logic between platforms. Inversion of Control through Dependency Injection and Property Injection.
    Downloads: 5 This Week
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  • 15
    ProxyKit

    ProxyKit

    A toolkit to create code-first HTTP reverse proxies on ASP.NET Core

    A toolkit to create code-first HTTP Reverse Proxies hosted in ASP.NET Core as middleware. This allows focused code-first proxies that can be embedded in existing ASP.NET Core applications or deployed as a standalone server. Deployable anywhere ASP.NET Core is deployable such as Windows, Linux, Containers and Serverless (with caveats). Having built proxies many times before, I felt it is time to make a package. Forked from ASP.NET labs, it has been heavily modified with a different API, to facilitate a wider variety of proxying scenarios (i.e. routing based on a JWT claim) and interception of the proxy requests/responses for customization of headers and (optionally) request/response bodies. It also uses HttpClientFactory internally that will mitigate against DNS caching issues making it suitable for microservice/container environments.
    Downloads: 5 This Week
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  • 16
    passcore

    passcore

    A self-service password management tool for Active Directory

    PassCore is a very simple 1-page web application written in C#, using ASP.NET Core, Material UI (React Components), and Microsoft Directory Services (Default provider). It allows users to change their Active Directory/LDAP password on their own, provided the user is not disabled. PassCore does not require any configuration, as it obtains the principal context from the current domain. I wrote this because a number of people have requested several features that the original version did not have. The original version of this tool was downloaded around 8000 times in 2.5 years. My hope is that the new version continues to be just as popular. There really is no free alternative out there (that I know of) so hopefully, this saves someone else some time and money. We recommend use the docker image and redirect the traffic to nginx.
    Downloads: 5 This Week
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  • 17
    AL-IV

    AL-IV

    ALFOUR Programming language. Simple, safe, power, multi-platform.

    A programming language AL-IV (ALFOUR) is a high-level imperative object oriented programming language with minimal introduction level, easy porting to any platform claiming a very high level of safety and stability, with a controllable level of code protection, high efficiency of an executable code, full independence from a target platform, minimal enter level.
    Downloads: 122 This Week
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  • 18
    JPPF

    JPPF

    The open source grid computing solution

    JPPF makes it easy to parallelize computationally intensive tasks and execute them on a Grid.
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    Downloads: 21 This Week
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  • 19
    Loxodon Framework

    Loxodon Framework

    An MVVM & Databinding framework that can use C# and Lua

    LoxodonFramework is a lightweight MVVM(Model-View-ViewModel) framework built specifically to target Unity3D. Databinding and localization are supported. It has a very flexible extensibility. It makes your game development faster and easier. For tutorials, examples, and support, please see the project. You can also discuss the project in the Unity Forums. The plugin is compatible with MacOSX, Windows, Linux, UWP, WebGL, IOS, and Android, and provides all the source code of the project. If you like this framework or think it is useful, please write a review on AssetStore or give me a STAR or FORK it on Github, thank you! Loxodon Framework Bundle is an AssetBundle manager.It provides a functionality that can automatically manage/load an AssetBundle and its dependencies from local or remote location.Asset Dependency Management including BundleManifest that keep track of every AssetBundle and all of their dependencies.
    Downloads: 4 This Week
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  • 20
    MahApps.Metro

    MahApps.Metro

    Cobble together a better UI for their own WPF applications

    MahApps.Metro is a framework that allows developers to cobble together a Metro or Modern UI for their own WPF applications with minimal effort. MahApps.Metro overrides the default style of all common WPF controls and gives them a modern look. MahApps.Metro also includes some custom controls based on concepts from Windows Phone, Windows 8 and Window 10 (UWP) Apps. You can install MahApps.Metro via the NuGet UI or with the Package Manager Console. If you want to use a pre-release packages of MahApps.Metro, you need to enable Include Prerelease in the NuGet UI. All resources of MahApp.Metro are located within separate resource dictionaries. To adopt the MahApps.Metro theme, you will need to add the resource dictionaries to your App.xaml. To start with the full MahApps styling and full window support you need to change your normal Window to our MetroWindow.
    Downloads: 4 This Week
    Last Update:
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  • 21
    NLua

    NLua

    Bridge between Lua and the .NET

    Bridge between Lua world and the .NET (compatible with .NET/UWP/Mac/Linux/Android/iOS/tvOS). NLua is a fork project of LuaInterface (from Fábio Mascarenhas/Craig Presti). You can use/instantiate any .NET class without any previous registration or annotation. NLua runs on top of KeraLua binding, it encodes the string using the ASCII encoding by default. If you want to use UTF-8 encoding, just set the Lua.State.Encoding property to Encoding.UTF8. Calling instance methods: To call instance methods you need to use the : notation, you can call methods from objects passed to Lua or to objects created inside the Lua context. Calling static methods: You can call static methods using only the class name and the . notation from Lua. If you are using Xamarin.iOS you need to Preserve the class you want to use inside NLua, otherwise the Linker will remove the class from final binary if the class is not in use.
    Downloads: 4 This Week
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  • 22
    Orchard Core

    Orchard Core

    Open-source modular and multi-tenant application framework

    Open-source, modular, multi-tenant application framework and CMS for ASP.NET Core. Orchard Core is a redevelopment of Orchard CMS on ASP.NET Core. Orchard Core consists of two different targets, Orchard Core Framework, an application framework for building modular, multi-tenant applications on ASP.NET Core, and Orchard Core CMS, a web content management system (CMS) built on top of the Orchard Core Framework. It’s important to note the differences between the framework and the CMS. Some developers who want to develop SaaS applications will only be interested in the modular framework. Others who want to build administrable websites will focus on the CMS and build modules to enhance their sites or the whole ecosystem. One of our goals is to enable community-based ecosystems of hosted applications that can be extended with modules, like eCommerce systems, blog engines and more.
    Downloads: 4 This Week
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  • 23
    Pokemon Unity

    Pokemon Unity

    A framework to build Pokémon RPG games

    A framework to build Pokémon RPG games. I use IIcolour Spectrum's original Pokemon Unity as a base with Herbertmilhomme's framework. So far, this project use wrapper ( Legacy <=> Framework ), and in the future, I want to remove the wrapper. This project is playable, but it has some issues and some features are disabled. Use Unity Hub or Editor to import this project's folder (/Pokemon Unity). Build and run the project. There are also demos for Windows, Linux, and Mac zipped in Releases!
    Downloads: 4 This Week
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  • 24
    RabbitMQ .NET Client

    RabbitMQ .NET Client

    RabbitMQ .NET client for .NET Standard 2.0+ and .NET 4.6.1+

    The RabbitMQ .NET client is an implementation of an AMQP 0-9-1 client library for C# (and, implicitly, other .NET languages). The library is open-source, and is dual-licensed under the the Apache License v2 and the Mozilla Public License v2.0. This means that the user can consider the library to be licensed under any of the licenses from the list above. For example, the user may choose the Apache Public License 2.0 and include this client into a commercial product. Codebases that are licensed under the GPLv2 may choose GPLv2, and so on. 6.x versions of the library require .NET 4.6.1 or a .NET Core version implementing .NET Standard 2.0. They also introduce potentially breaking public API changes covered in the changelog. 4.x and 5.x versions of the library require .NET 4.5.1 or later or .NET Core. For .NET Core users, 2.0 is the minimum supported version for 5.x series.
    Downloads: 4 This Week
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  • 25
    SignalR

    SignalR

    Incredibly simple real-time web for .NET

    Today's modern apps are expected to deliver up-to-date information without hitting a refresh button. Add real-time functionality to your dashboards, maps, games and more. What is real-time functionality? It's the ability to have your server-side code push content to connected clients as it happens, in real-time. SignalR hubs can be written in C# code and added to your ASP.NET app, alongside your pages and APIs. The simple programming model integrates seamlessly with other ASP.NET features like dependency injection, authentication, authorization, and scalability. While chat is often used as an example, you can do a whole lot more. Any time a user refreshes a web page to see new data, or the page implements Ajax long polling to retrieve new data, it's candidate for using SignalR. SignalR also enables completely new types of applications that require high-frequency updates from the server, such as real-time gaming.
    Downloads: 4 This Week
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