Top I3 GitHub Repositories & Tools (2026)

A free, open-source Windows desktop organizer with native-feeling WinUI 3 widgets.

FastAPI framework, high performance, easy to learn, fast to code, ready for production

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

Fan and lighting control for Acer laptops

Modular Windows/Android toolkit for Arknights: Endfield: BEM model mods and creator tools, native plug-ins, MMD playback, camera/UI controls, character voices, title-screen customization, and PC combat/gacha tools.

Lightweight native Windows GUI client for Xray core, built with WinUI 3

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

🐹 Cleanup, app management, maintenance, disk analysis, and live status in one free, open-source, native Mac app + extensive support for AI agents.

Open-source OpenAPI mock server with cloud hosting and local modes for development, testing, and CI. Generates realistic API responses from specs with latency simulation, error injection, proxy fallback, and request validation. Validated against 2,200+ real-world OpenAPI specs.

TokenSpeed is a speed-of-light LLM inference engine.

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.

The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀

Media Player .NET Library for WinUI 3/ WPF/WinForms (based on FFmpeg/DirectX)

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

Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.

AeroSpace is an i3-like tiling window manager for macOS

.NET MAUI is the .NET Multi-platform App UI, a framework for building native device applications spanning mobile, tablet, and desktop.

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

OpenAPI 3.0 and 3.1 and 3.2 (and Swagger v2) implementation for Go (parsing, converting, validation, and more)

A small, yet powerful framework, designed for building applications across all XAML platforms. Its strong support for MV* patterns will enable you to build your solution quickly, without the need to sacrifice code quality or testability.