244.4k
React
The library for web and native user interfaces, enabling the creation of complex, interactive UIs with a component-based approach.
👨💻
Development🟡
JavaScript🌐
Web🧰
Framework
Best Open-Source Framework Tools in 2026
A curated list of the best, top, and most popular open-source framework tools available right now. Showing the top 30 of 82 framework tools in our directory, ranked by GitHub stars.
- 159.2k
Transformers
State-of-the-art Machine Learning library for Pytorch, TensorFlow, and JAX, providing thousands of pre-trained models for natural language processing, computer vision, and other areas.
🤖 AI🧰 Framework🔬 Data Science - 138.9k
Next.js
Next.js is the React framework for production, enabling React-based web applications to be built with ease, offering a powerful, fully featured, headless solution.
👨💻 Development🧰 Framework⚛️ React🌐 Web - 120.8k
Electron
Build cross-platform desktop apps using JavaScript, HTML, and CSS with Electron, integrating web technologies into native desktop applications.
👨💻 Development🧰 Framework💻 Desktop🟡 JavaScript - 109.3k
Godot
Godot Engine – A comprehensive, multi-platform 2D and 3D game engine, ideal for game developers of any skill level.
👨💻 Development🎮 Game Development🛠️ Tools🧰 Framework - 94.5k
Tailwind CSS
Tailwind CSS is a popular utility-first CSS framework that enables rapid and customizable user interface development through low-level utility classes.
🎨 Styling🧰 Framework🌐 Web - 77.8k
RAGFlow
RAGFlow is a leading open-source Retrieval-Augmented Generation (RAG) engine that combines advanced RAG methods with Agent capabilities, delivering a superior, context-rich experience for Large Language Models (LLMs). It enables efficient information retrieval and contextual augmentation, optimizing generative AI pipelines.
🤖 AI🔁 API🧰 Framework🛠️ Tools - 69.1k
Lobe Chat
An open-source, modern-design AI chat framework supporting multiple AI providers such as OpenAI, Claude 3, Gemini, Ollama, DeepSeek, and Qwen. It offers features like knowledge base management, multi-modality support through plugins and artifacts, and easy deployment for private AI applications like ChatGPT and Claude.
🤖 AI🧰 Framework⚙️ DevOps - 58.4k
Astro
Astro is a modern web framework designed for building fast, content-focused websites. It leverages an island architecture to optimize performance.
👨💻 Development🧰 Framework🌐 Web - 57.0k
Autogen
A comprehensive programming framework for building agentic AI applications, supporting various integrations and community interactions.
🤖 AI🧰 Framework👨💻 Development - 56.0k
Gatsby
The best React-based framework with performance, scalability, and security built in, perfect for building fast and modern websites.
🧰 Framework🌐 Web⚛️ React🏎️ Performance - 48.7k
Expo
An open-source framework for creating universal native apps with React, running seamlessly on Android, iOS, and the web. It simplifies the process of building and deploying applications.
👨💻 Development🧰 Framework⚛️ React Native⚛️ React📱 Mobile Our Newsletter
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- 41.3k
Hexo
A fast, simple, and powerful open-source blog framework powered by Node.js, designed for creating and deploying static sites with ease.
📝 CMS🌐 Web🟡 JavaScript🧰 Framework - 40.7k
Daisyui
A popular, free, and open-source Tailwind CSS component library offering a wide range of components for rapid UI development.
👨💻 Development🧰 Framework🎨 Styling🧩 Component Libraries - 36.1k
Tiptap
The headless rich text editor framework for web artisans, providing flexibility and extensibility for creating custom text editing experiences.
👨💻 Development🧰 Framework🌐 Web - 36.0k
Fastify
Fastify is a fast and low overhead web framework designed for Node.js, providing an efficient and scalable server infrastructure.
🧰 Framework👨💻 Development💚 Node.js - 35.0k
CrewAI
An advanced framework for orchestrating role-playing, autonomous AI agents, enabling collaborative intelligence for tackling complex tasks.
🤖 AI🧰 Framework👨💻 Development - 34.8k
Bulletproof React
A simple, scalable, and powerful architecture for building production-ready React applications with a focus on maintainability and best practices.
👨💻 Development🏗️ Architecture🧰 Framework⚛️ React - 34.5k
Refine
A versatile React Framework for crafting internal tools, admin panels, dashboards, and B2B apps with unmatched flexibility.
🧰 Framework⚛️ React👨💻 Development🛠️ Tools - 30.2k
Iced
A cross-platform GUI library for Rust, inspired by Elm. Provides a reactive programming model, customizable widgets, and native and web rendering support for building modern user interfaces.
👨💻 Development🧰 Framework🦀 Rust💻 Desktop - 28.8k
Create T3 App
The best way to start a full-stack, typesafe Next.js app, integrating TypeScript, Tailwind CSS, and Prisma.
👨💻 Development🧰 Framework🛠️ Tools🚀 Starters - 26.6k
React-admin
A frontend Framework for building single-page applications on top of REST/GraphQL APIs, utilizing TypeScript, React, and Material Design.
🧰 Framework⚛️ React🔁 API👨💻 Development - 26.0k
Table
Headless UI for building powerful tables and datagrids in TypeScript/JavaScript, compatible with React, Vue, Solid, and Svelte.
👨💻 Development🧰 Framework🛠️ Tools🟡 JavaScript - 24.8k
Haystack
AI orchestration framework to build customizable, production-ready LLM applications. Connect components such as models, vector databases, and file converters to pipelines or agents that can interact with your data. Best suited for building Retrieval-Augmented Generation (RAG), question answering, semantic search, or conversational agent chatbots.
🤖 AI🧰 Framework⚙️ DevOps🔬 Data Science - 23.5k
GrapesJS
GrapesJS is a next-generation free and open source web builder framework, designed for building templates without coding experience.
👨💻 Development🧰 Framework👨🎨 Design🌐 Web - 22.9k
Mastra
mastra is a powerful TypeScript AI agent framework designed for building intelligent assistants, retrieval-augmented generation (RAG) systems, and advanced observability features. It supports integration with any large language model (LLM), including GPT-4, Claude, Gemini, and Llama.
🤖 AI👨💻 Development🔷 TypeScript🧰 Framework - 22.0k
Stagehand
An AI-powered web browsing framework that emphasizes simplicity and extensibility, allowing for easy customization and integration with various web applications.
👨💻 Development🤖 AI🧰 Framework - 22.0k
Letta
Letta is an open AI platform for building stateful agents with advanced memory, learning, and self-improvement capabilities. It enables the creation of intelligent agents that remember, adapt, and evolve over time.
🤖 AI🧰 Framework🛠️ Tools - 21.4k
Parse Server
Parse Server for Node.js and Express, an open source backend as a service framework providing powerful features for mobile and web apps.
👨💻 Development🔁 API🧰 Framework💚 Node.js - 19.7k
Ignite
Infinite Red's battle-tested React Native project boilerplate with a CLI, component and model generators, building on 9 years of development.
👨💻 Development🧰 Framework📱 Mobile⌨️ CLI
Frequently asked questions
What is the best open-source framework tool in 2026?
React is the most popular by GitHub stars right now. The library for web and native user interfaces, enabling the creation of complex, interactive UIs with a component-based approach.
Are these framework tools free?
Yes. Every tool on this list is open source and free to use in your own projects. Many can be self-hosted.
How is this list ranked?
Tools are ranked by GitHub star count, a strong proxy for community adoption and active maintenance. Star counts are refreshed regularly.
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