1.QuantConnect / Lean
Lean Algorithmic Trading Engine by QuantConnect (Python, C#)
+3,729 stars
from 18,607 · score 8.22
Trending repositories
Ranked by Attention Score: stars gained over the last 180 complete days
1–100 of 157 by Attention Score · May 7, 2026 – Nov 2, 2026 (UTC)
2.icsharpcode / ILSpy
.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!
+2,000 stars
from 24,906 · score 7.60
3.AvaloniaUI / Avalonia
Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI
+1,345 stars
from 30,398 · score 7.20
4.StockSharp / StockSharp
Algorithmic trading and quantitative trading open source platform to develop trading robots (stock markets, forex, crypto, bitcoins, and options).
+1,265 stars
from 9,772 · score 7.14
5.MonoGame / MonoGame
One framework for creating powerful cross-platform games.
+860 stars
from 13,736 · score 6.76
6.google / flatbuffers
FlatBuffers: Memory Efficient Serialization Library
+849 stars
from 25,752 · score 6.75
7.duplicati / duplicati
Store securely encrypted backups in the cloud!
+783 stars
from 14,395 · score 6.66
8.studyzy / imewlconverter
”深蓝词库转换“ 一款开源免费的输入法词库转换程序
+705 stars
from 9,792 · score 6.56
9.JustArchiNET / ArchiSteamFarm
C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.
+657 stars
from 13,125 · score 6.49
10.shadowsocks / shadowsocks-windows
A C# port of shadowsocks
+485 stars
from 59,019 · score 6.19
11.mRemoteNG / mRemoteNG
mRemoteNG is the next generation of mRemote, open source, tabbed, multi-protocol, remote connections manager.
+480 stars
from 10,703 · score 6.18
12.abpframework / abp
Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with best practices on top of the .NET. Provides the fundamental infrastructure, cross-cutting-concern implementations, startup templates, application modules, UI themes, tooling and documentation.
+312 stars
from 14,154 · score 5.75
13.QuestPDF / QuestPDF
QuestPDF is a modern library for PDF document generation. Its fluent C# API lets you design complex layouts with clean, readable code. Create documents using a flexible, component-based approach.
+305 stars
from 13,911 · score 5.72
14.chocolatey / choco
Chocolatey - the package manager for Windows
+285 stars
from 11,277 · score 5.66
15.dotnet / efcore
EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.
+270 stars
from 14,544 · score 5.60
16.MaterialDesignInXAML / MaterialDesignInXamlToolkit
Google's Material Design in XAML & WPF, for C# & VB.Net.
+261 stars
from 16,028 · score 5.57
17.unoplatform / uno
Open-source platform for building cross-platform native Mobile, Web, Desktop, and Embedded apps from a single C#/XAML codebase. Work from any IDE/CLI with Hot Reload, Visual Designer, MCPs, and Skills built for modern .NET workflows. 200M+ NuGet downloads.
+244 stars
from 9,855 · score 5.50
18.EvotecIT / OfficeIMO
MIT-licensed, COM-free .NET libraries for creating, reading, editing, converting, rendering, and extracting Office, PDF, email, OneNote, and text formats.
+201 stars
from 448 · score 5.31
19.TASEmulators / BizHawk
BizHawk is a multi-system emulator written in C#. BizHawk provides nice features for casual gamers such as full screen, and joypad support in addition to full rerecording and debugging tools for all system cores.
+194 stars
from 2,619 · score 5.27
20.OrchardCMS / OrchardCore
Orchard Core is an open-source modular and multi-tenant application framework built with ASP.NET Core, and a content management system (CMS) built on top of that framework.
+192 stars
from 8,031 · score 5.26
21.MessagePack-CSharp / MessagePack-CSharp
Extremely Fast MessagePack Serializer for C#(.NET, .NET Core, Unity, Xamarin). / msgpack.org[C#]
+187 stars
from 6,624 · score 5.24
22.kanaka / mal
mal - Make a Lisp
+179 stars
from 10,576 · score 5.19
23.riok / mapperly
A .NET source generator for generating object mappings. No runtime reflection.
+175 stars
from 4,027 · score 5.17
24.SteamRE / SteamKit
SteamKit2 is a .NET library designed to interoperate with Valve's Steam network. It aims to provide a simple, yet extensible, interface to perform various actions on the network.
+165 stars
from 3,056 · score 5.11
25.dotnet / BenchmarkDotNet
Powerful .NET library for benchmarking
+163 stars
from 11,363 · score 5.10
26.reactiveui / refit
The automatic type-safe REST library for .NET. Refit turns a REST API into a C# interface and generates the HttpClient implementation, with support for HttpClientFactory, pluggable serializers and a testing package.
+141 stars
from 9,436 · score 4.96
27.SixLabors / ImageSharp
A modern, cross-platform, 2D Graphics library for .NET
+140 stars
from 7,905 · score 4.95
28.PrismLibrary / Prism
Prism is a framework for building loosely coupled, maintainable, and testable XAML applications in WPF, Xamarin Forms, and Uno / Win UI Applications..
+139 stars
from 6,727 · score 4.94
29.bchavez / Bogus
:card_index: A simple fake data generator for C#, F#, and VB.NET. Based on and ported from the famed faker.js.
+138 stars
from 9,612 · score 4.93
30.jstedfast / MailKit
A cross-platform .NET library for IMAP, POP3, and SMTP.
+133 stars
from 6,737 · score 4.90
31.MapsterMapper / Mapster
A fast, fun and stimulating object to object Mapper
+123 stars
from 5,061 · score 4.82
32.MassTransit / MassTransit
Distributed Application Framework for .NET
+117 stars
from 7,696 · score 4.77
33.quartznet / quartznet
Quartz Enterprise Scheduler .NET
+111 stars
from 6,992 · score 4.72
34.JamesNK / Newtonsoft.Json
Json.NET is a popular high-performance JSON framework for .NET
+109 stars
from 11,213 · score 4.70
35.MahApps / MahApps.Metro
A framework that allows developers to cobble together a better UI for their own WPF applications with minimal effort.
+105 stars
from 9,730 · score 4.66
36.ChilliCream / graphql-platform
Welcome to the home of the Hot Chocolate GraphQL server for .NET, the Strawberry Shake GraphQL client for .NET and Nitro the awesome Monaco based GraphQL IDE.
+104 stars
from 5,659 · score 4.65
37.Cysharp / MagicOnion
Unified Realtime/API framework for .NET platform and Unity.
+98 stars
from 4,362 · score 4.60
38.AngleSharp / AngleSharp
:angel: The ultimate angle brackets parser library parsing HTML5, MathML, SVG and CSS to construct a DOM based on the official W3C specifications.
+93 stars
from 5,455 · score 4.54
39.Squirrel / Squirrel.Windows
An installation and update framework for Windows desktop apps
+91 stars
from 7,898 · score 4.52
40.cefsharp / CefSharp
.NET (WPF and Windows Forms) bindings for the Chromium Embedded Framework
+90 stars
from 10,177 · score 4.51
41.sschmid / Entitas
Entitas is a super fast Entity Component System (ECS) Framework specifically made for C# and Unity
+90 stars
from 7,590 · score 4.51
42.Shane32 / QRCoder
A pure C# Open Source QR Code implementation
+84 stars
from 5,091 · score 4.44
43.npgsql / npgsql
Npgsql is the .NET data provider for PostgreSQL.
+82 stars
from 3,666 · score 4.42
44.xunit / xunit
xUnit.net is a free, open source, community-focused unit testing tool for .NET.
+76 stars
from 4,540 · score 4.34
45.aspnetboilerplate / aspnetboilerplate
ASP.NET Boilerplate - Web Application Framework
+75 stars
from 11,923 · score 4.33
46.StackExchange / StackExchange.Redis
The Redis client for .NET
+72 stars
from 6,134 · score 4.29
47.louthy / language-ext
C# pure functional programming framework - come and get declarative!
+71 stars
from 7,012 · score 4.28
48.microsoft / CNTKArchived
Microsoft Cognitive Toolkit (CNTK), an open source deep-learning toolkit
+69 stars
from 17,514 · score 4.25
49.helix-toolkit / helix-toolkit
Helix Toolkit is a collection of 3D components for .NET.
+69 stars
from 2,219 · score 4.25
50.adamhathcock / sharpcompress
SharpCompress is a fully managed C# library to deal with many compression types and formats.
+68 stars
from 2,527 · score 4.23
51.akkadotnet / akka.net
Canonical actor model implementation for .NET with local + distributed actors in C# and F#.
+65 stars
from 5,031 · score 4.19
52.moonsharp-devs / moonsharp
An interpreter for the Lua language, written entirely in C# for the .NET, Mono, Xamarin and Unity3D platforms, including handy remote debugger facilities.
+64 stars
from 1,559 · score 4.17
53.mono / CppSharp
Tools and libraries to glue C/C++ APIs to high-level languages
+61 stars
from 3,347 · score 4.13
54.opentk / opentk
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL, OpenAL & OpenCL. It also includes windowing, mouse, keyboard and joystick input and a robust and fast math library, giving you everything you need to write your own renderer or game engine. OpenTK can be used standalone or inside a GUI on Windows, Linux, Mac.
+59 stars
from 3,488 · score 4.09
55.SignalR / SignalR
Incredibly simple real-time web for .NET
+57 stars
from 9,345 · score 4.06
56.NetTopologySuite / NetTopologySuite
A .NET GIS solution that is fast and reliable for the .NET platform.
+55 stars
from 1,673 · score 4.03
57.cake-build / cake
:cake: Cake (C# Make) is a cross platform build automation system.
+50 stars
from 4,149 · score 3.93
58.jbevain / cecil
Cecil is a library to inspect, modify and create .NET programs and libraries.
+49 stars
from 2,959 · score 3.91
59.rebus-org / Rebus
:bus: Simple and lean service bus implementation for .NET
+49 stars
from 2,625 · score 3.91
60.snozbot / fungus
An easy to use Unity 3D library for creating illustrated Interactive Fiction games and more.
+49 stars
from 1,907 · score 3.91
61.GitTools / GitVersion
From git log to SemVer in no time
+48 stars
from 3,098 · score 3.89
62.icsharpcode / AvalonEdit
The WPF-based text editor component used in SharpDevelop
+48 stars
from 2,039 · score 3.89
63.NLog / NLog
NLog - Flexible and Structured Logging for various .NET Platforms
+47 stars
from 6,499 · score 3.87
64.nsubstitute / NSubstitute
A friendly substitute for .NET mocking libraries.
+47 stars
from 2,936 · score 3.87
65.autofac / Autofac
An addictive .NET IoC container
+44 stars
from 4,618 · score 3.81
66.sqlkata / querybuilder
SQL query builder, written in c#, helps you build complex queries easily, supports SqlServer, MySql, PostgreSql, Oracle, Sqlite and Firebird
+43 stars
from 3,339 · score 3.78
67.MaximumADHD / Roblox-Studio-Mod-Manager
An open-source custom bootstrapper for Roblox Studio that allows you to override files in Roblox Studio's directory, opt into development branches of Roblox, and experiment with Fast Flags.
+42 stars
from 354 · score 3.76
68.oxyplot / oxyplot
A cross-platform plotting library for .NET
+40 stars
from 3,503 · score 3.71
69.mcintyre321 / OneOf
Easy to use F#-like ~discriminated~ unions for C# with exhaustive compile time matching
+39 stars
from 4,021 · score 3.69
70.octokit / octokit.net
A GitHub API client library for .NET
+36 stars
from 2,823 · score 3.61
71.IronLanguages / ironpython3
Implementation of Python 3.x for .NET Framework that is built on top of the Dynamic Language Runtime.
+36 stars
from 2,726 · score 3.61
72.dotnet / coreclrArchived
CoreCLR is the runtime for .NET Core. It includes the garbage collector, JIT compiler, primitive data types and low-level classes.
+34 stars
from 12,721 · score 3.56
73.oqtane / oqtane.framework
Oqtane is an open-source developer productivity platform for building modern .NET applications and websites that run on Web, Desktop and Mobile.
+34 stars
from 2,225 · score 3.56
74.neuecc / UniRxArchived
Reactive Extensions for Unity
+32 stars
from 7,288 · score 3.50
75.jstedfast / MimeKit
A .NET MIME creation and parser library with support for S/MIME, PGP, DKIM, TNEF and Unix mbox spools.
+32 stars
from 1,979 · score 3.50
76.xceedsoftware / DocX
Fast and easy to use .NET library that creates or modifies Microsoft Word files without installing Word.
+31 stars
from 1,893 · score 3.47
77.nunit / nunit
NUnit Framework
+30 stars
from 2,602 · score 3.43
78.tmenier / Flurl
Fluent URL builder and testable HTTP client for .NET
+29 stars
from 4,378 · score 3.40
79.fluentassertions / fluentassertions
A very extensive set of extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style unit tests. Targets .NET Framework 4.7, as well as .NET Core 2.1, .NET Core 3.0, .NET 6, .NET Standard 2.0 and 2.1. Supports the unit test frameworks MSTest2, NUnit3, XUnit2, MSpec, and NSpec3.
+29 stars
from 3,784 · score 3.40
80.lukencode / FluentEmail
All in one email sender for .NET. Supports popular senders (SendGrid, MailGun, etc) and Razor templates.
+29 stars
from 3,189 · score 3.40
81.fo-dicom / fo-dicom
Fellow Oak DICOM for .NET, .NET Core, Universal Windows, Android, iOS, Mono and Unity
+29 stars
from 1,190 · score 3.40
82.ServiceStack / ServiceStack
Thoughtfully architected, obscenely fast, thoroughly enjoyable web services for all
+27 stars
from 5,474 · score 3.33
83.MvvmCross / MvvmCross
The .NET MVVM framework for cross-platform solutions, including Android, iOS, MacCatalyst, macOS, tvOS, WPF, WinUI
+27 stars
from 3,895 · score 3.33
84.rabbitmq / rabbitmq-dotnet-client
RabbitMQ .NET client for .NET Standard 2.0+ and .NET 4.6.2+
+27 stars
from 2,262 · score 3.33
85.confluentinc / confluent-kafka-dotnet
Confluent's Apache Kafka .NET client
+26 stars
from 253 · score 3.30
86.StephenCleary / AsyncEx
A helper library for async/await.
+25 stars
from 3,702 · score 3.26
87.VsVim / VsVim
Vim Emulator Plugin for Visual Studio 2015+
+24 stars
from 3,746 · score 3.22
88.elastic / elasticsearch-net
This strongly-typed, client library enables working with Elasticsearch. It is the official client maintained and supported by Elastic.
+24 stars
from 3,630 · score 3.22
89.BcryptNet / bcrypt.net
BCrypt.Net - Bringing updates to the original bcrypt package
+24 stars
from 975 · score 3.22
90.lofcz / FastCloner
The fastest deep cloning library for .NET – zero-config, works out of the box.
+24 stars
from 351 · score 3.22
91.FoundatioFx / Foundatio
Pluggable foundation blocks for building distributed apps.
+23 stars
from 2,081 · score 3.18
92.dotpcap / sharppcap
Official repository - Fully managed, cross platform (Windows, Mac, Linux) .NET library for capturing packets
+23 stars
from 1,461 · score 3.18
93.SonarSource / sonar-dotnet
Code analyzer for C# and VB.NET projects
+23 stars
from 899 · score 3.18
94.eventflow / EventFlow
Async/await first CQRS+ES and DDD framework for .NET
+22 stars
from 2,548 · score 3.14
95.Handlebars-Net / Handlebars.Net
A real .NET Handlebars engine
+22 stars
from 1,444 · score 3.14
96.zarusz / SlimMessageBus
Lightweight message bus interface for .NET (pub/sub and request-response) with transport plugins for popular message brokers.
+21 stars
from 639 · score 3.09
97.IgnaceMaes / MaterialSkin
Theming .NET WinForms, C# or VB.Net, to Google's Material Design Principles.
+20 stars
from 3,026 · score 3.04
98.statianzo / Fleck
C# Websocket Implementation
+20 stars
from 2,424 · score 3.04
99.giacomelli / GeneticSharp
GeneticSharp is a fast, extensible, multi-platform and multithreading C# Genetic Algorithm library that simplifies the development of applications using Genetic Algorithms (GAs).
+20 stars
from 1,356 · score 3.04
100.Caliburn-Micro / Caliburn.Micro
A small, yet powerful framework, designed for building applications across all XAML platforms. Its strong support for MV* patterns will enable you to build your solution quickly, without the need to sacrifice code quality or testability.
+19 stars
from 2,846 · score 3.00