Top CSHARP GitHub Repositories & Tools (2026)

The Free Software Media System - Server Backend & API

A Windows share target for bringing WeChat chat archives to ChatGPT.

A modern file manager that helps users organize their files and folders.

Free and open-source PDF editor for Windows with a built-in PDF 2.0 engine. View, annotate, OCR, merge, split, crop, rotate, compare, edit text, draw, sign, fill forms, print, flatten, and open password-protected PDFs without a subscription.

C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.

Free, open-source display control for Windows 11: one brightness slider for every monitor (DDC/CI and laptop panels), night light, focus mode, keep awake, per-monitor taskbar hiding and glass, OLED care, your monitor's own settings, hotkeys and a CLI.

Microsoft Fluent UI Blazor components library. For use with ASP.NET Core Blazor applications

Free and open-source software that allows users to set animated desktop wallpapers and screensavers powered by WinUI 3.

Source 2 Viewer is an all-in-one tool to browse VPK archives, view, extract, and decompile Source 2 assets, including maps, models, materials, textures, sounds, and more.

Radzen Blazor is the most sophisticated free UI component library for Blazor, featuring 145+ native components including DataGrid, Scheduler, Charts, and advanced theming with full support for Material Design and Fluent UI. If Radzen Blazor is useful to you, a ⭐ on GitHub helps other Blazor developers find it.

Pulumi - Infrastructure as Code in any programming language 🚀

The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.

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.

ASP.NET Boilerplate - Web Application Framework

A tool for generating code based on a GraphQL schema and GraphQL operations (query/mutation/subscription), with flexible support for custom plugins.

Polyglot document intelligence with a Rust core: extract text, metadata, images, tables, and structured data from 106 formats across 140 file extensions, plus code intelligence for 371 languages. Fifteen bindings, with CLI, REST API, and MCP server.

A composable, cross-platform MVVM framework for .NET inspired by functional reactive programming. It moves mutable state out of the user interface, keeps each feature's logic in one readable place, and makes applications easier to test. Supports WPF, WinForms, WinUI, .NET MAUI, Avalonia, Uno Platform, Blazor and Android.

Aspire is the tool for code-first, extensible, observable dev and deploy.

The Windows App SDK empowers all Windows desktop apps with modern Windows UI, APIs, and platform features, including back-compat support, shipped via NuGet.

A modular, extensible 2D game framework for .NET.