Open source. Open possibilities.

Egg is an enterprise-grade Node.js framework built on Koa, offering built-in process management, a plugin system, and framework customization for building scalable server applications.

A functional and stateful Go framework for building terminal user interfaces (TUIs) based on The Elm Architecture.

Expo is an open-source framework for building universal native apps with React that run on Android, iOS, and the web. The repository bundles the Expo SDK, Modules API, CLI, Router, Go client, templates, and documentation.

LlamaIndex is an open-source data framework designed to build agentic applications by augmenting LLMs with private data.

Monkshu is a complete JavaScript-based enterprise application server built on Node.js. It provides a unified platform with a Web Components frontend, REST API backend, mobile app frameworks for iOS and Android, Electron desktop support, and PWA capabilities—all with minimal external dependencies.

Nuxt is a free, open-source full-stack framework for building type-safe, performant Vue.js applications with server-side rendering, static generation, automatic routing, and 300+ extensible modules.

Franken UI (franken-ui/ui) is described as an HTML-first UI component library built on UIkit 3, extended with LitElement and inspired by shadcn/ui. Its README now only announces a move to 0build, so documentation lives elsewhere.

An 'awesome' list collecting JavaScript frameworks, web component libraries, UI component libraries for React, Vue, Angular, and more, mobile UI components, admin templates, and icon libraries. It includes GitHub star and npm download badges, and covers both active and historically significant projects.

MediaPipe is Google's cross-platform framework and suite of on-device machine learning solutions for live and streaming media, covering vision, text and audio tasks on Android, iOS, web, desktop and edge devices.

Ruby on Rails is a full-stack web application framework that follows the MVC pattern. It includes Active Record for database modeling, Action Pack for routing and controllers, Action View for templating, and additional libraries for mailers, jobs, WebSockets, file storage, and rich text handling. It enables rapid development of database-backed web applications.

Numl is a deprecated UI design language, web-component library and runtime CSS framework for quickly building interfaces that follow a design system, loadable with a single JavaScript module and no bundler or config.

Sparkle 2 is a secure software update framework for macOS that provides seamless, fast, and reliable application updates with sandboxing, delta updates, and customizable user interfaces.

Reflex is a library for building full-stack web applications using pure Python, eliminating the need for JavaScript for frontend development.

Django is a high-level Python web framework for rapid development and clean, pragmatic design. Includes installation docs, tutorials, deployment guides, community links, contribution info, and test suite instructions.

Textual is a lean Python framework for building cross-platform terminal and browser user interfaces with a simple API, widgets, CSS-like styling, async support, and a dev console.

Elysia is an ergonomic TypeScript web framework powered by Bun, focusing on end-to-end type safety and developer experience.

Spring Boot is an opinionated, production-grade framework for building stand-alone Spring-based Java applications and services. It offers embedded servers, security, metrics, health checks, and simplified configuration, with no code generation or XML requirements.

Open-source disassembly framework written in pure C, supporting 20+ architectures including x86, ARM, AArch64, RISC-V, MIPS and PowerPC, with a clean architecture-neutral API, multi-language bindings, and detailed instruction semantics for binary analysis and reverse engineering.

Material Design for Bootstrap is a free UI kit offering 700+ components, themes, and templates for building responsive, mobile-first websites. Available for jQuery, Angular, React, and Vue under MIT license.

A lightweight .NET library for building text-based adventure games, with rooms, NPCs, items, commands, conversations, maps, rendering frames and save support.