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Top 23 C# Roslyn Projects
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Roslyn
The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.
Project mention: I'm writing a history of Visual Basic, Chapter 1 is up | news.ycombinator.com | 2026-05-11VB.NET is open source, supports AOT, and there is little else that VB 6 does better, other than COM integration, which .NET was always a bit lower level
https://github.com/dotnet/roslyn
Now I bet what you mean is the graphical part, and yes that is only partial open source.
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ReSharper
ReSharper is now available in VS Code and Cursor. ReSharper brings a professional toolset for C# developers backed by over 20 years of experience, enterprise-grade security, SOC 2 compliance, and the trust of companies worldwide.
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Uno Platform
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.
> I like WASM and I want to like WASM but the rate of maturity within the ecosystem is incredibly abysmal.
The C# toolchain for WebAssembly is pretty good. You can do a lot with Avalonia and Uno:
https://avaloniaui.net/
https://platform.uno/
Here's a C# clone of Visual Basic compiled to WebAssembly:
https://bandysc.github.io/AvaloniaVisualBasic6/
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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PolySharp
PolySharp provides generated, source-only polyfills for C# language features, to easily use all runtime-agnostic features downlevel. Add a reference, set your C# version to latest and have fun! 🚀
Project mention: Comptime – C# meta-programming with compile-time code generation and evaluation | news.ycombinator.com | 2025-12-20You add PolySharp to your source generator project to get back some of the modern C# features. https://github.com/Sergio0694/PolySharp
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Meziantou.Analyzer
A powerful C# Roslyn analyzer that uses static analysis to detect bugs, surface security issues, and enforce best practices—helping developers and AI write more reliable code.
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Buildalyzer
A utility to perform design-time builds of .NET projects without having to think too hard about it.
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Mockaco
🐵 HTTP mock server, useful to stub services and simulate dynamic API responses, leveraging ASP.NET Core features, built-in fake data generation and pure C# scripting
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Westwind.Scripting
Dynamically compile and execute C# Code and Expressions at runtime. Also includes a light weight script templating engine using Handlebar style C# syntax.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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# Roslyn discussion
C# Roslyn related posts
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Introducing Fuse v5: Up to 7.4x Faster dotnet build and 5.7x Faster dotnet test for AI Agents
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I'm writing a history of Visual Basic, Chapter 1 is up
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Unions merged into .NET 11 SDK Preview 3
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Banned C++ Features in Chromium
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How to update library and get swamped with this task.
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PeachPie Compiler: Compile and run PHP on top of .NET runtime
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Meziantou.Analyzer alternatives - Roslynator and sonar-dotnet
3 projects | 28 Sep 2024 -
A note from our sponsor - AppSignal
www.appsignal.com | 16 Oct 2026
Index
What are some of the best open-source Roslyn projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Roslyn | 20,720 |
| 2 | Uno Platform | 10,080 |
| 3 | mapperly | 4,180 |
| 4 | Roslynator | 3,488 |
| 5 | dotnet-script | 3,012 |
| 6 | RoslynPad | 2,826 |
| 7 | ScriptCS | 2,481 |
| 8 | PeachPie | 2,481 |
| 9 | NetPad | 2,281 |
| 10 | PolySharp | 2,235 |
| 11 | omnisharp-roslyn | 2,069 |
| 12 | jab | 1,252 |
| 13 | Meziantou.Analyzer | 1,206 |
| 14 | security-code-scan | 972 |
| 15 | sonar-dotnet | 920 |
| 16 | CodeConverter | 914 |
| 17 | Buildalyzer | 688 |
| 18 | PluginFramework | 600 |
| 19 | FastCloner | 373 |
| 20 | Mockaco | 351 |
| 21 | LinqGen | 316 |
| 22 | Westwind.Scripting | 255 |
| 23 | AsyncFixer | 213 |
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www.jetbrains.com