Top SYSTEM GitHub Repositories & Tools (2026)

Themeable design system for the SEEK Group

UNIGIT public brand and ecosystem hub — AI should work for everyone.

A low-level build system, used by Xcode and the Swift Package Manager

Build a system, load it until it breaks, and watch why. A system design simulator for learning distributed systems.

Request Tracker, an enterprise-grade issue tracking system

SEED Design System

An open source ML system for the end-to-end data science lifecycle

Generic and simple controls framework for ROS 2

Microsoft Build Accelerator

Understand any codebase instantly. System intelligence for codebases, built for humans and AI.

Open-source design-method engine for Claude Code, Codex & Cursor. 23 agent skills for fixed design judgment, multiple grammars, semantic palettes, reference compilation, and evidence-verified UI. MIT.

Sudoless Apple Silicon system monitor (native SwiftUI GUI) with ANE / Media Engine / memory-bandwidth tracking

Free, open-source church management software for people, families, groups, events, attendance, giving, volunteers, and more. No subscription. Your data is yours.

A flexible, elegant, fast and easy-to-use content management system written in PHP.

Confidential Consortium Framework

A set of React components for the PatternFly project.

Official repository for Concrete CMS development

System profiler and benchmark tool for Linux systems

Hints, grids and vim keys for your whole desktop. Built for macOS, linux and windows, natively.

Enables organizations to create and deploy customizable AI agents with support for multiple LLM providers, real-time chat, voice, document training, analytics, user management, SSO authentication, and embeddable widgets. Built with React 19, Redux Toolkit, Radix UI, and Tailwind CSS.