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Top 23 C# csharp-library Projects
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fluentui-blazor
Microsoft Fluent UI Blazor components library. For use with ASP.NET Core Blazor applications
Project mention: Building the Same App Using Various Web Frameworks | news.ycombinator.com | 2024-09-10Now do the same using Blazor Server (C#). For convenience use https://www.fluentui-blazor.net/ or https://mudblazor.com/ for your UI components.
It has it's compromises but it's great for just building stuff, with UI updates streamed to the client, no JS (or as much as you want), no extra API building just for the sake of your SPA. Note that I'm not talking about Blazor WASM.
If you're interested in working as a developer for corporations outside of the SF bubble (e.g. the other 80% that use Windows instead of macOS) it's worth checking out, especially for internal corporate stuff.
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abot
Cross Platform C# web crawler framework built for speed and flexibility. Please star this project! +1.
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Why this change? The previous terminology caused frequent misunderstandings about component roles. While we acknowledge the new approach isn't perfect, we prioritized shipping V10. For V11, we plan to refine the setup experience – share your suggestions in our GitHub discussions.
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NetFabric.Hyperlinq
High performance LINQ implementation with minimal heap allocations. Supports enumerables, async enumerables, arrays and Span<T>.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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Keras.NET
Keras.NET is a high-level neural networks API for C# and F#, with Python Binding and capable of running on top of TensorFlow, CNTK, or Theano.
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BakingSheet
Easy datasheet management for C# and Unity. Supports Excel, Google Sheet, JSON and CSV format.
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AStar
A fast 2D path finding library based on the A* algorithm. Works with both grids and graphs. Supports any .NET variant that supports .NETStandard 2.0 or higher. This library has no external dependencies. The library is licensed under the MIT license. (by roy-t)
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Financial-Formulas-Library-.NET-Standard
A collection of methods for solving Finance/Accounting equations, implemented in C#.
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Hazel-Networking
Hazel Networking is a low level networking library for C# providing connection orientated, message based communication via TCP, UDP and RUDP. (by DarkRiftNetworking)
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Disqord
An asynchronous Discord API wrapper for .NET 5 that aims to make Discord bot development simple and enjoyable.
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Not too familiar with C#, but it seems they have okay null-safety, and with some work you can have exhaustivity checked matches on sum types.
https://github.com/WalkerCodeRanger/ExhaustiveMatching
I prefer languages that have been designed with this in mind. Kotlin in this case goes a long way.
Golang is shit IHMO. No null-safety. No sum types. I dont know what Rob Pike was thinking when he designed this. Total disregard for the last 40 years of innovation in software engineering. Sad.
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hivemq-mqtt-client-dotnet
The HiveMQ C# Asynchronous MQTT client for .NET featuring full MQTT 5.0 and back pressure support.
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guerrillantp
Simple NTP (SNTP) client library providing .NET applications with accurate network time.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C# csharp-library discussion
C# csharp-library related posts
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Working with interfaces
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C# different way to do a proof of concept
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FluentValidation inline validate
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My Animal Mart (Part 2) - The data config problem.
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Configure Renovate to handle nuspec files
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Usando o MongoDB com C# e .Net Core
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Question about Entity Framework query.
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A note from our sponsor - SaaSHub
www.saashub.com | 31 Aug 2025
Index
What are some of the best open-source csharp-library projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | fluentui-blazor | 4,492 |
| 2 | UnityLibrary | 4,164 |
| 3 | MongoDB | 3,206 |
| 4 | abot | 2,289 |
| 5 | Brighter | 2,261 |
| 6 | NetFabric.Hyperlinq | 893 |
| 7 | barcodelib | 784 |
| 8 | Keras.NET | 617 |
| 9 | BakingSheet | 390 |
| 10 | AStar | 346 |
| 11 | SharpCaster | 320 |
| 12 | LinqGen | 313 |
| 13 | RESTCountries.NET | 293 |
| 14 | Financial-Formulas-Library-.NET-Standard | 261 |
| 15 | Typin | 250 |
| 16 | Tiny.RestClient | 209 |
| 17 | Hazel-Networking | 205 |
| 18 | Disqord | 169 |
| 19 | ProfanityDetector | 151 |
| 20 | ExhaustiveMatching | 82 |
| 21 | hivemq-mqtt-client-dotnet | 78 |
| 22 | guerrillantp | 73 |
| 23 | CSLisp | 64 |
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