KnifeLemon / Filee

Free, open-source file converter. Convert 255 formats offline by drag & drop — images, PDF, Word, Excel, PowerPoint, HWP/HWPX, video, audio, e-books and archives. No upload, no Office needed.

ahwootech / BRUTAL

A free, open source C# framework for making games, or your own game engine. Direct access to native APIs and Vulkan, with the low-level libraries around them. The foundation under Kitten Space Agency and RimWorld's Waylith engine.

PCL-Community / PCL-CE

PCL 社区版 由社区开发者维护与管理

Zaneris / passenger

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.

k1tbyte / Wand-Enhancer

Advanced UX and interoperability extension for Wand (WeMod) app

bitwarden / server

Backend APIs, SQL Server database, and Docker deployment tooling for the Bitwarden password manager clients.

JosefNemec / Playnite

Open source video game library manager and launcher that unifies games from Steam, Epic, GOG, EA App, Battle.net and other sources.

ShareX / ShareX

ShareX is a free and open-source application that enables users to capture or record any area of their screen with a single keystroke. It also supports uploading images, text, and various file types to a wide range of destinations.

itsfatduck / optimizerDuck

Free, open-source Windows optimization tool for performance, privacy, and simplicity.

jellyfin / jellyfin

The Free Software Media System - Server Backend & API

ralphtradesz / trading-hub

Plataforma de trading gratis y de código abierto para Mac (con guía para portarla a Windows con Claude): footprint, DOM, backtesting anti-sobreoptimización y estrategias con IA. 100 % local.

files-community / Files

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

icsharpcode / ILSpy

Cross-platform .NET assembly browser and decompiler that turns compiled assemblies back into readable C#.

DevToys-app / DevToys

A Swiss Army knife for developers.

sharpemu / sharpemu

An experimental PlayStation 5 emulator for Windows, Linux and macOS.

zion-sati / NetWasm

Compile C# and .NET CIL to small standalone Wasm with WASI (AOT with built-in Runtime and Precise GC)

OpenRA / OpenRA

Open-source real-time strategy engine that runs early Westwood classics like Command & Conquer: Red Alert on modern systems.

aethai / ro3emu-server

Open-source Ragnarok Online 3 (RO3) PC server emulator in C# / .NET 10. Client-documented protocol, multiplayer systems, tools and research.

lively-community / lively

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

MonoGame / MonoGame

One framework for creating powerful cross-platform games.

NickvisionApps / Parabolic

Desktop GUI for yt-dlp that downloads video and audio from hundreds of websites on Linux, Windows, and macOS.

JustArchiNET / ArchiSteamFarm

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

Kareadita / Kavita

Kavita is a fast, feature rich, cross platform reading server. Built with the goal of being a full solution for all your reading needs. Setup your own server and share your reading collection with your friends and family.

tui-cs / Terminal.Gui

Cross Platform Terminal UI toolkit for .NET

pardeike / Harmony

A library for patching, replacing and decorating .NET and Mono methods during runtime

microsoft / aspire

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

Mzying2001 / CefFlashBrowser

Flash浏览器 / Flash Browser

kwsch / PKHeX

Pokémon Save File Editor

cyanfish / naps2

Scan documents to PDF and more, as simply as possible.

Ruben2776 / PicView

Fast, free and customizable picture viewer

UglyToad / PdfPig

Read and extract text and other content from PDFs in C# (port of PDFBox)

jenius-apps / ambie

An app that uses white noise, nature sounds, and focus features to boost your productivity.

mikependon / RepoDB

A production-ready data access platform for .NET applications.

JaneySprings / DotRush

Lightweight C# development environment for VSCode

zhongkaifu / TensorSharp

A native .NET LLM inference engine and agent runtime for GGUF models. TensorSharp provides a console application, a web-based chatbot interface, iPhone App, and Ollama/OpenAI-compatible HTTP APIs for programmatic access. It supports Windows/MacOS/iOS/Linux with full GPU capability

witchscottishfoldcat / WitchDrawer

轻量级 Windows 桌面文件收纳工具，支持拖放、路径映射和快捷搜索。A lightweight Windows desktop file organizer built with native WPF.

BYTEX-TRADE / bytex

Event-driven algorithmic trading engine for .NET. Write a strategy once and run it unchanged in backtest, paper and live trading, deterministic, with fixed-point money and adapters for Binance, Bybit, OKX, Kraken, Bitget, Gate, KuCoin and Hyperliquid.

maximilian467 / Developer-Island

A Dynamic Island for Windows: Claude Code & Codex usage, now playing, focus timer, calendar and system health in one native capsule. Local-first.

itsnik-scrpt / FigmaBridge

Figma-to-Engine UI Pipeline: Figma Auto-Layout → Unity UI Toolkit (UMG & Godot on roadmap) via WebSocket hot-reload and an IR layout compiler

mxgmn / WaveFunctionCollapse

Bitmap & tilemap generation from a single example with the help of ideas from quantum mechanics

peass-ng / PEASS-ng

PEASS - Privilege Escalation Awesome Scripts SUITE (with colors)

dotnet / BenchmarkDotNet

Powerful .NET library for benchmarking

MudBlazor / MudBlazor

Blazor Component Library based on Material Design principles. Do more with Blazor, utilizing CSS and keeping JavaScript to a bare minimum.

AutoDarkMode / Windows-Auto-Night-Mode

Automatically switches between the dark and light theme of Windows 10 and Windows 11

AssetRipper / AssetRipper

GUI application that extracts and converts assets from Unity game files into the native Unity engine format for analysis.

stride3d / stride

Stride (formerly Xenko), a free and open-source cross-platform C# game engine.

HandyOrg / HandyControl

Contains some simple and commonly used WPF controls

umbraco / Umbraco-CMS

Umbraco is a free and open source .NET content management system helping you deliver delightful digital experiences.

mcmonkeyprojects / SwarmUI

SwarmUI (formerly StableSwarmUI), A Modular Stable Diffusion Web-User-Interface, with an emphasis on making powertools easily accessible, high performance, and extensibility.

radzenhq / radzen-blazor

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.

OpenTabletDriver / OpenTabletDriver

Open source, cross-platform, user-mode tablet driver

PintaProject / Pinta

Simple GTK Paint Program

FNA-XNA / FNA

FNA - Accuracy-focused XNA4 reimplementation for open platforms

shrimqy / Sefirah

Phone Link / KDE Connect alternative

DotNetAnalyzers / StyleCopAnalyzers

An implementation of StyleCop rules using the .NET Compiler Platform

openai / openai-dotnet

The official .NET library for the OpenAI API

yhuse / SunnyUI

SunnyUI.NET 是基于.NET Framework 4.0+、.NET6、.NET8、.NET9 框架的 C# WinForm UI、开源控件库、工具类库、扩展类库、多页面开发框架。

snownico0722 / PaperTodo

A minimalist Windows desktop sticky note tool. It puts a few quiet, usable, and unobtrusive sheets of paper on your desktop. Native WPF, with support for to-dos and Markdown.——极简 Windows 桌面便签工具。让桌面上有几张安静、可用、不会打扰人的纸。WPF 原生，支持待办与 Markdown。

ValveResourceFormat / ValveResourceFormat

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.

immichFrame / ImmichFrame

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