Csharp GitHub Repositories (2026) · Open Source Tools

Free, open-source file converter. Convert 263 formats offline by drag & drop — images, PDF, Word, Excel, PowerPoint, HWP/HWPX, video, audio, e-books and archives. No upload, no Office needed.

Speech-to-text, text-to-speech, speaker diarization, speech enhancement, source separation, and VAD using next-gen Kaldi with onnxruntime without Internet connection. Support embedded systems, Android, iOS, HarmonyOS, Raspberry Pi, RISC-V, RK NPU, Axera NPU, Ascend NPU, x86_64 servers, websocket server/client, support 12 programming languages

Open-source Windows game resource manager. Suppresses background processes, gives games exclusive CPU cores, steers device interrupts off game cores, applies per-game GPU driver, memory and power policies, and restores every change after play. No injection, no telemetry. GPL-3.0.

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.

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

Local Windows iPhone/iPad mirroring over USB and AirPlay with D3D11 preview, multi-device sessions, OBS output, and a standalone driver manager.

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.

A clean-room reimplementation of the Project I.G.I. and I.G.I. 2 engine in C#/.NET 10. It plays the original missions faithfully, with a modern renderer (D3D12, Vulkan, WebGPU, ray tracing, DLSS), co-op, mods and a launcher.

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

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.

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

Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface for your games.

Rapid Application Development (RAD) Environment for Autodesk Revit®

GUI application to analyze game files

Lightweight embeddable web server written in pure C# with few dependencies to 3rd-party libraries.

An experimental PlayStation 5 emulator for Windows and Linux

Simple GTK Paint Program

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.

Desktop app of Euterpe, the Muse Dash community platform for custom charts, mods, and creator tools

Enterprise-grade feature flag platform that you can self-host. Get started - free.