Dark Mode GitHub Repositories (2026) · Open Source Tools

UI for AI agents. React components for what agents do – agent trees, tool calls, traces, handoffs and approvals – and for the rest of your app. One file each, install with shadcn or via MCP. Free and open source.

Leading Git-based headless CMS. Successor to Netlify/Decap CMS. Modern UX, first-class i18n support, mobile support + numerous improvements. Framework-agnostic, open source & free.

Restyle any website

Cross-platform desktop GUI app to clean image metadata

💡 Auto dark mode based on ambient light sensor for Android.

Dark Reader Chrome and Firefox extension

Avalonia theme inspired by Semi Design

Smart context menu for all windows in the system

Free ADB GUI and Android Emulator control panel for macOS. One click for dark mode, font scale, RTL and pseudo-locales, TalkBack, layout bounds, network speed and GPS: no adb commands. Layout Inspector in dp for any app (Compose and Views) with Figma overlay and TalkBack-order audit. Plus an MCP server for AI agents.

Turn Off the Lights Browser extension for Google Chrome, Firefox, Opera, Safari, Naver Whale, Yandex, Samsung Internet, and Microsoft Edge.

👑 The all-in-one macOS menu bar companion: customizable controls, system monitor, AI Agent, Shortcuts, widgets, remote control, and more.

This userscript for YouTube offers 250+ layout changes and features such as tab view, speed control, miniplayer support, export transcripts, square design, auto-theater mode, and much more—all easily customizable via settings panels.

The most complete color system for SwiftUI: 740 colors, 20 semantic tokens, dark mode and WCAG contrast built in, and a theme from any brand hex. Docs: colortokenskit.com

React UI components of the Yamada, by the Yamada, for the Yamada built with React and Emotion.

Laravel user management with Bootstrap 4 and 5, roles and permissions, account settings, avatars, emails, notifications, and optional package management.

Offline MCP server for Basecoat UI (shadcn/ui look, no React): templates, macro layouts, theming/dark-mode contract, static validation.

Demonstrates iOS SwiftUI Accessibility programming techniques using live good and bad examples that can be tested with VoiceOver and other AT. Includes documentation for developers explaining how to code accessible patterns for iOS.