# Agent Frameworks

> Open-source frameworks and SDKs for building, orchestrating, and deploying AI agents.

Agent frameworks are the libraries and SDKs you build on to orchestrate LLM calls, tools, memory, and multi-agent workflows — the scaffolding between a raw model API and a working agent. The decision usually hinges on your language, how much control versus abstraction you want, and whether you need production features like observability, retries, durable execution, and human-in-the-loop checkpoints. Lightweight libraries give you fine-grained control and stay out of the way but leave more to wire up yourself; higher-level frameworks move faster at the cost of flexibility and can be harder to debug when an abstraction leaks. Check first-class support for your model providers and for tool and function calling, then look at how state and memory are handled and whether streaming works end to end. Most frameworks are open source and free; many companies pair an open-source core with a paid hosted platform for tracing, deployment, and scale, so factor in where this will actually run in production. In a field moving this fast, ecosystem and momentum matter more than feature checklists — a framework with active maintainers, real adoption, and solid docs will save you more time than one with a longer feature list and a stalled repository. Prototype your hardest workflow in two candidates before committing; the one that fights you least is usually the right answer.

31 tools indexed. Sponsored placements are labeled and never ranked; open-source ordering reflects real GitHub adoption. Browse on the web: https://agentsearchengine.app/category/agent-frameworks

## Commercial products (alphabetical — stars don't measure commercial adoption)
- [CrewAI Platform](https://agentsearchengine.app/agents/crewai-platform) — Framework and platform for orchestrating role-playing multi-agent crews. · Freemium · Platform
- [LangGraph](https://agentsearchengine.app/agents/langgraph-platform) — LangChain's low-level orchestration framework for stateful, controllable agents. · Freemium · Framework · best for production agents that need controllable, stateful, graph-based orchestration

## Open-source index (ranked by adoption)
1. [langchain](https://agentsearchengine.app/agents/langchain) — The agent engineering platform. · Open source · Framework · 143k★ · Python · MIT · active 1 day ago · best for builders who want composable primitives and the broadest ecosystem of integrations for llm applications
2. [ruflo](https://agentsearchengine.app/agents/ruflo) — The leading agent meta-harness. Deploy intelligent multi-player swarms, coordinate autonomous workflows, and build conversational AI systems. · Open source · Framework · 67k★ · TypeScript · MIT · active 1 day ago · best for adding tools, memory, loops, and sandboxes on top of claude code or codex
3. [autogen](https://agentsearchengine.app/agents/autogen) — A programming framework for agentic AI · Open source · Framework · 60k★ · Python · CC-BY-4.0 · active 3 months ago · best for research-grade multi-agent conversation patterns backed by microsoft
4. [crewAI](https://agentsearchengine.app/agents/crewai) — Framework for orchestrating role-playing, autonomous AI agents. By fostering collaborative intelligence, CrewAI empowers agents to work together seamlessly, tackling complex tasks. · Open source · Framework · 57k★ · Python · MIT · active today · best for orchestrating role-based multi-agent crews in python with an approachable api
5. [pydantic-ai](https://agentsearchengine.app/agents/pydantic-ai) — AI Agent Framework, the Pydantic way · Open source · Framework · 19k★ · Python · MIT · active today · best for python teams that want type-safe agent development with the pydantic philosophy
6. [eliza](https://agentsearchengine.app/agents/eliza) — Open source agentic operating system · Open source · Framework · 19k★ · TypeScript · MIT · active today · best for a local-first agent os running on desktop, mobile, or as a system assistant
7. [SuperAGI](https://agentsearchengine.app/agents/superagi) — <> SuperAGI - A dev-first open source autonomous AI agent framework. Enabling developers to build, manage & run useful autonomous agents quickly and reliably. · Open source · Framework · 18k★ · Python · MIT · active 1 year ago · best for provisioning and running concurrent autonomous agents with extensible tooling
8. [agent-framework](https://agentsearchengine.app/agents/agent-framework) — A framework for building, orchestrating and deploying AI agents and multi-agent workflows with support for Python and.NET. · Open source · Framework · 13k★ · Python · MIT · active today · best for production multi-agent workflows in .net or python with microsoft tooling
9. [hive](https://agentsearchengine.app/agents/hive) — Multi-Agent Harness for Production AI · Open source · Framework · 11k★ · Python · Apache-2.0 · active 2 months ago · best for production agent workloads needing state, failure recovery, and human oversight
10. [evolver](https://agentsearchengine.app/agents/evolver) — The GEP-powered self-evolving engine for AI agents. Auditable evolution with Genes, Capsules, and Events. | evomap.ai · Open source · Framework · 8.9k★ · JavaScript · GPL-3.0 · active 7 days ago
11. [Upsonic](https://agentsearchengine.app/agents/upsonic) — Build autonomous AI agents in Python. · Open source · Framework · 7.9k★ · Python · MIT · active 1 month ago
12. [yao](https://agentsearchengine.app/agents/yao) — Build AI agents and web apps — with a single binary. · Open source · Framework · 7.6k★ · Go · active today
13. [harness-sdk](https://agentsearchengine.app/agents/harness-sdk) — Build an agent harness and control it end-to-end. Open-source SDK for production AI agents in Python & TypeScript - any model, any cloud. · Open source · SDK / library · 6.8k★ · Python · Apache-2.0 · active today
14. [open-multi-agent](https://agentsearchengine.app/agents/open-multi-agent) — TypeScript multi-agent orchestration framework. Describe a goal, a coordinator decomposes it into a task DAG that runs on any LLM: Claude, ChatGPT, Gemini, DeepSeek, or local models. · Open source · Framework · 6.7k★ · TypeScript · MIT · active 1 day ago
15. [intentkit](https://agentsearchengine.app/agents/intentkit) — IntentKit is an open-source, self-hosted cloud agent cluster that manages a collaborative team of AI agents for you. · Open source · Framework · 6.5k★ · Python · MIT · active 2 days ago
16. [agents](https://agentsearchengine.app/agents/agents) — An Open-source Framework for Data-centric, Self-evolving Autonomous Language Agents · Open source · Framework · 6.0k★ · Python · Apache-2.0 · active 1 year ago
17. [rllm](https://agentsearchengine.app/agents/rllm) — Democratizing Reinforcement Learning for LLMs · Open source · Framework · 5.8k★ · Python · Apache-2.0 · active 3 days ago
18. [agent-governance-toolkit](https://agentsearchengine.app/agents/agent-governance-toolkit) — AI Agent Governance Toolkit — Policy enforcement, zero-trust identity, execution sandboxing, and reliability engineering for autonomous AI agents. Covers 10/10 OWASP Agentic Top 10. · Open source · SDK / library · 5.6k★ · Python · MIT · active today
19. [ag2](https://agentsearchengine.app/agents/ag2) — AG2 (formerly AutoGen): The Open-Source AgentOS.Join us at: https://discord.gg/sNGSwQME3x · Open source · Framework · 4.8k★ · Python · Apache-2.0 · active today
20. [youtu-agent](https://agentsearchengine.app/agents/youtu-agent) — A simple yet powerful agent framework that delivers with open-source models · Open source · Framework · 4.6k★ · Python · active 4 months ago
21. [fast-agent](https://agentsearchengine.app/agents/fast-agent) — Code, Build and Evaluate agents - excellent Model and Skills/MCP/ACP/A2A Support · Open source · Framework · 3.9k★ · Python · Apache-2.0 · active today
22. [opengap](https://agentsearchengine.app/agents/opengap) — A framework-agnostic, git-native standard for defining AI agents · Open source · Framework · 2.9k★ · TypeScript · MIT · active 1 month ago
23. [Vibe-Skills](https://agentsearchengine.app/agents/vibe-skills) — Vibe-Skills is an all-in-one AI skills package. · Open source · SDK / library · 2.6k★ · Python · Apache-2.0 · active today
24. [harmonist](https://agentsearchengine.app/agents/harmonist) — Portable AI agent orchestration with mechanical protocol enforcement. 186 agents, zero runtime dependencies. · Open source · Framework · 2.4k★ · Python · MIT · active 1 month ago
25. [verl-agent](https://agentsearchengine.app/agents/verl-agent) — verl-agent is an extension of veRL, designed for training LLM/VLM agents via RL. verl-agent is also the official code for paper "Group-in-Group Policy Optimization for LLM Agent Training" · Open source · Framework · 2.2k★ · Python · Apache-2.0 · active 1 month ago
26. [yomo](https://agentsearchengine.app/agents/yomo) — Serverless AI Agent Framework with Geo-distributed Edge AI Infra. · Open source · Framework · 1.9k★ · Rust · active 3 days ago
27. [DemoGPT](https://agentsearchengine.app/agents/demogpt) — Create LLM agents in a second with your prompts. Everything you need to create an LLM Agent - tools, prompts, frameworks, and models - all in one place. · Open source · Framework · 1.9k★ · Python · MIT · active 4 months ago
28. [Agently](https://agentsearchengine.app/agents/agently) — [GenAI Application Development Framework] Build GenAI application quick and easy Easy to interact with GenAI agent in code using structure data and chained-calls syntax Use Event-Driven Flow · Open source · Framework · 1.6k★ · Python · Apache-2.0 · active 3 days ago
29. [flowcraft](https://agentsearchengine.app/agents/flowcraft) — Production-grade Go SDK for building AI agents with long-term memory, knowledge retrieval, and voice — runnable as a library, a daemon, or a real-time pipeline. · Open source · SDK / library · 484★ · Go · MIT · active today

## Frequently asked
**What is an AI agent framework?**
A framework provides the building blocks — tool calling, memory, planning, and multi-agent orchestration — for constructing agents in code, instead of wiring everything to an LLM API by hand.

**Which agent framework should I use?**
Match it to your stack and control needs: lightweight libraries give fine-grained control, higher-level platforms trade flexibility for speed. Check language support, production tooling, and how active the project is.

**Are agent frameworks open source?**
Most are. Many companies pair an open-source framework with a paid hosted platform for deployment, tracing, and scaling.

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Source: [Agent Search Engine](https://agentsearchengine.app). Full directory in one file: https://agentsearchengine.app/llms-full.txt