App Frameworks

Libraries for building LLM-powered applications

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Hugging Face Transformers

⭐ 162.7k

The definitive library for working with pre-trained transformer models.

intermediate

modelspythonhuggingface

Dify

⭐ 149.3k

Open-source platform for building LLM apps with a visual workflow editor.

beginner

low-codeworkflowrag

LangChain

⭐ 142.1k

The most popular LLM app framework with the largest ecosystem.

beginner

ragagentschains

AutoGen

⭐ 59.8k

Microsoft's multi-agent conversation framework for building complex LLM workflows.

intermediate

multi-agentmicrosoftconversation

CrewAI

⭐ 55.8k

Multi-agent orchestration framework with role-based agent design.

intermediate

agentsmulti-agentorchestration

LiteLLM

⭐ 54.0k

Universal API proxy that provides a unified OpenAI-compatible interface to 100+ LLM providers.

beginner

proxygatewayopenai-compatible

LlamaIndex

⭐ 50.9k

Purpose-built for RAG and data retrieval pipelines.

beginner

ragindexingpython

LangGraph

⭐ 37.6k

Framework for building stateful, multi-step agent workflows as graphs.

intermediate

agentsstate-machinegraph

Semantic Kernel

⭐ 28.3k

Microsoft's lightweight SDK for integrating LLMs into conventional applications.

intermediate

microsoftenterprisecsharp

OpenAI Agents SDK

⭐ 28.0k

OpenAI's official framework for building multi-agent workflows with handoffs and guardrails.

intermediate

agentsopenaipython

Haystack

⭐ 25.9k

Production-ready framework for building LLM applications with composable pipelines.

intermediate

ragpipelinespython

Vercel AI SDK

⭐ 25.6k

The go-to TypeScript toolkit for building AI-powered web apps with streaming UI.

beginner

typescriptstreamingreact

OpenRouter

⭐ 1.3k

Unified API gateway providing access to hundreds of models from multiple providers.

beginner

api-gatewaymulti-modelrouting

All Projects

• AutoGen — Microsoft's multi-agent conversation framework for building complex LLM workflows.
• CrewAI — Multi-agent orchestration framework with role-based agent design.
• Dify — Open-source platform for building LLM apps with a visual workflow editor.
• Haystack — Production-ready framework for building LLM applications with composable pipelines.
• LangChain — The most popular LLM app framework with the largest ecosystem.
• LangGraph — Framework for building stateful, multi-step agent workflows as graphs.
• LiteLLM — Universal API proxy that provides a unified OpenAI-compatible interface to 100+ LLM providers.
• LlamaIndex — Purpose-built for RAG and data retrieval pipelines.
• OpenAI Agents SDK — OpenAI's official framework for building multi-agent workflows with handoffs and guardrails.
• OpenRouter — Unified API gateway providing access to hundreds of models from multiple providers.
• Semantic Kernel — Microsoft's lightweight SDK for integrating LLMs into conventional applications.
• Hugging Face Transformers — The definitive library for working with pre-trained transformer models.
• Vercel AI SDK — The go-to TypeScript toolkit for building AI-powered web apps with streaming UI.