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An open-source IDE for C# and .NET, built with Avalonia, for Windows, macOS and Linux: a Roslyn-powered editor, its own debugger with Hot Reload, a CPU and memory profiler, XAML tooling for Avalonia and WPF, and an MCP server for coding agents.
A .NET source generator for generating object mappings. No runtime reflection.
C# and Razor compiler playground in the browser via Blazor WebAssembly
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.
A modern, cross platform IDE for .NET, built with .NET & Godot
PeachPie - the PHP compiler and runtime for .NET and .NET Core
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! 🚀
OmniSharp server (HTTP, STDIO) based on Roslyn workspaces
Convert code from C# to VB.NET and vice versa using Roslyn
A visual studio extension which enhances syntax highlighting, quick info (tooltip), navigation bar, scrollbar, display quality, and brings smart tool bar with code refactoring to code editor.
A Roslyn source generator for creating constructors.
Raven is a pragmatic, typed, general-purpose programming language for .NET.
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.
Local-first static analysis for EF Core: finds performance and correctness problems (SaveChanges in loops, unbounded queries, cartesian Includes, sync-over-async, unsafe raw SQL) with evidence and remediation.
The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.