Are all of these tools AGPL-free?

Yes. None of the listed tools ship under AGPL. The most common licenses are MIT and Apache 2.0, both permissive for commercial use.

Which open-source AI agent has the most stars?

AutoGen leads with 103k GitHub stars. See the momentum leaders section above for the full top 5.

How do you pick which open-source tools to list?

We list tools with a public repo, a working install path, and recent commits. Abandoned repos (no pushes in 12+ months) are flagged or removed.

Open Source AI Tools (2026) 72

72 open-source AI agents with public GitHub repositories, including OpenHands, Meta AI FAIR, Luminal. Self-host, fork, or contribute.

Last updated: May 17, 2026

Reviewed by Mathijs Bronsdijk · Updated May 17, 2026

Want any no-cost option (not just open source)? See /free.

GitHub momentum leaders

Top by stars

1. AutoGen — 103k stars
2. Agno — 39k stars
3. 01.AI Yi — 7.8k stars
4. Agency Swarm — 4.2k stars
5. Arize Phoenix — 113 stars

Most recent releases

License mix: Apache 2.0 (2), MIT (2). All listed tools are viewable on GitHub.

Editor's picks

Best for agent tools & integrations

Langfuse

free tier, paid from $2/month, 5.0 user rating

Best for agent frameworks

AutoGen

103k GitHub stars, free to use

Best for ai model providers

01.AI Yi

7.8k GitHub stars, free to use

Best for coding agents

OpenHands

free to use, 4.5 user rating

Best for browser agents

Playwright MCP

free to use, 4.5 user rating

1

OpenHands

Open-source platform for autonomous AI coding agents with sandboxed execution

OpenHands is an open-source, model-agnostic platform for building and running autonomous AI coding agents, with 71K+ GitHub stars, Docker sandboxing, and support for 75+ LLM providers.

Listedfree tier Coding Agents

Repository not availableAlternatives to OpenHands

2

Meta AI FAIR

Open AI research and models for language, vision, and multimodal systems

Meta AI FAIR develops open models and research tools for language, perception, and multimodal AI for researchers and developers.

Listedfree tier

Repository not availableAlternatives to Meta AI FAIR

3

Luminal

Open-source ML compiler for faster PyTorch inference with optimized CUDA kernels

Luminal is open-source ai inference software that compiles PyTorch models into optimized CUDA kernels for faster inference on any hardware.

Listedfree tier AI Model Providers

Repository not availableAlternatives to Luminal

4

r/LocalLLaMA

Reddit hub for running LLMs locally, from models to hardware

Join r/LocalLLaMA to explore local AI: self-hosted LLMs, Qwen, Gemma, DeepSeek, inference tools, GPU builds, and more.

Listedfree tier

Repository not availableAlternatives to r/LocalLLaMA

5

Milvus

Open-source vector database for fast embedding search at scale.

Milvus turns embeddings into fast similarity search, with Lite, Standalone, and Distributed deployments. Used by Salesforce and Reddit.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Milvus

6

Weaviate

Open-source AI retrieval database with hybrid search and RAG.

Weaviate combines hybrid search, RAG, and agentic AI for retrieval-heavy apps. Plans start with a free 14-day trial, then Flex at $45/month.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Weaviate

7

Qdrant

Vector database for AI search with hybrid retrieval and filtering.

Qdrant is a vector database with hybrid search, metadata filtering, and OpenAPI v3 clients. Plans include Free Tier and usage-based Standard Tier.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Qdrant

8

Haystack

Open-source AI pipelines with explicit control over retrieval, tools, and memory.

Haystack is an open-source AI orchestration framework for modular pipelines, advanced RAG, and agents. Used by NVIDIA and AWS.

Listedfree tier Agent Frameworks

Repository not availableAlternatives to Haystack

9

Semantic Kernel

A framework that turns prompts and APIs into function calls.

Semantic Kernel turns prompts and APIs into function calls for AI agents, with C#, Python, and Java support.

Listedfree tier Agent Frameworks

Repository not availableAlternatives to Semantic Kernel

10

Cline

AI coding assistant for multi-file edits, commands, and editor workflows.

Cline is an AI coding assistant for multi-file edits and command execution in VS Code. Open Source is free; Enterprise is custom.

Listedfree tier Coding Agents

Repository not availableAlternatives to Cline

11

PydanticAI

Typed agent workflows with explicit tools, hooks, and validation.

PydanticAI builds typed agent workflows with Pydantic models, Function Tools, and Hooks, with integrations across OpenAI, Anthropic, and LangChain.

Listedfree tier Agent Frameworks

Repository not availableAlternatives to PydanticAI

12

Agno

Python agent framework and runtime with FastAPI scaffolding.

Apache 2.0-licensed, 39k stars, active releases.

Listedfree tier39k starsApache 2.0Agent Frameworks

Repository not availableAlternatives to Agno

13

Aider

Terminal AI coding assistant that edits code in context.

Aider edits code in context with repository maps, Git, and live testing across 100+ languages.

Listedfree tier Coding Agents

Repository not availableAlternatives to Aider

14

SWE-agent

An LM-driven agent for repository-level coding tasks.

SWE-agent lets a language model browse repos, edit code, and run files. It reports 19.2k GitHub stars and 2.1k forks.

Listedfree tier Coding Agents

Repository not availableAlternatives to SWE-agent

15

LlamaIndex

Open-source document AI for turning files into agent-ready data.

LlamaIndex turns PDFs, scans, and forms into structured data with OCR and extraction. Plans run Free, Starter Custom, Pro Custom, and Enterprise Custom.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to LlamaIndex

16

Playwright MCP

Official browser automation for AI agents and web workflows.

Playwright MCP adds controlled browser automation for AI agents. Free $0USDper user/month; Team $4USDper user/month; Enterprise $21USDper user/month.

Listedfree tier Browser Agents

Repository not availableAlternatives to Playwright MCP

17

Langfuse

AI observability for tracing, prompts, evaluations, and analytics.

Langfuse combines tracing, prompt management, and evaluations; plans start at Hobby free and Core $29/month.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Langfuse

18

LangSmith

Trace, evaluate, and deploy agents in one platform.

LangSmith traces and evaluates AI agents with Observability, Evaluation, and Deployment. Plans start at $0 / seat per month.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to LangSmith

19

Activepieces

AI-assisted automations with templates, agents, and governance controls.

Activepieces builds AI automations with 705+ integrations, AI agents, and governance controls. Standard is free; Unlimited is custom.

Listedfree tier Workflow Automation

Repository not availableAlternatives to Activepieces

20

Firecrawl

Live web pages to Markdown, JSON, screenshots, and semantic text.

Firecrawl turns live web pages into Markdown, JSON, and screenshots. Plans start Free, with Hobby at $9/month and Enterprise custom.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Firecrawl

21

Stagehand

Open source browser automation with deterministic and agentic flows.

Stagehand is an open source browser automation framework with act(), extract(), observe(), and agent() flows for Chromium browsers.

Listedfree tier Browser Agents

Repository not availableAlternatives to Stagehand

22

Skyvern

Open-source browser automation for login-heavy workflows.

Skyvern automates browser workflows with CAPTCHA support, 2FA, and data extraction. Plans start at Free $0/month and go to Enterprise custom.

Listedfree tier Browser Agents

Repository not availableAlternatives to Skyvern

23

Agency Swarm

Open-source framework for coordinating agent roles, prompts, and tools.

MIT-licensed, 4.2k stars, active releases.

Listedfree tier4.2k starsMITAgent Frameworks

Repository not availableAlternatives to Agency Swarm

24

Flowise

Open-source visual builder for AI agents and workflows.

Flowise builds AI agents and workflows visually, with drag-and-drop no-code and low-code flows for RAG, SQL chatbots, and Bedrock apps.

Listedfree tier No-Code/Low-Code Builders

Repository not availableAlternatives to Flowise

25

Browser Use

Browser automation that turns instructions into structured outputs.

Browser Use turns natural-language instructions into browser actions with JSON, CSV, and webhook outputs. Plans start at Free $0/mo.

Listedfree tier Browser Agents

Repository not availableAlternatives to Browser Use

26

Dify

AI app platform for workflows, RAG, tools, and observability.

Dify builds AI apps with drag-and-drop workflows, RAG, and native MCP integration. Plans start with Sandbox free and Professional at $59/month.

Listedfree tier No-Code/Low-Code Builders

Repository not availableAlternatives to Dify

27

LangGraph Platform

Deploy and govern production agents with tracing, evals, and APIs.

LangGraph Platform deploys production agents with tracing, evals, Fleet, and one-click APIs. Plans start at $0/seat/month.

Listedfree tier Agent Frameworks

Repository not availableAlternatives to LangGraph Platform

28

Zep

Context infrastructure for agents from memory, data, and behavior.

Zep assembles agent context from memory and business data, with Flex starting at $125/month.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Zep

29

Opik

Trace, test, and monitor agent behavior in one platform.

Opik traces and evaluates AI agents with Test Suites, LLM-as-a-Judge metrics, and production monitoring. Plans start free; Pro Cloud is $19/month.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Opik

30

Langflow

Visual AI app and agent builder with Python flexibility.

Langflow builds AI apps and agents with visual flows, Structured Output, and Flow as an API. Used by BetterUp and IBM.

Listedfree tier No-Code/Low-Code Builders

Repository not availableAlternatives to Langflow

31

Arize Phoenix

Open-source tracing and evaluation for agent workflows.

113 stars, last release 10 months ago.

Listedfree tier113 starsAgent Tools & Integrations

Repository not availableAlternatives to Arize Phoenix

32

LiteLLM

OpenAI-compatible gateway for routing, tracking, and governing LLM traffic.

LiteLLM routes LLM traffic through one OpenAI-compatible gateway with budgets, fallbacks, and observability. Open Source is $0; Enterprise is custom.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to LiteLLM

33

E2B

Cloud sandboxes for AI agents to run code and tools.

E2B runs isolated cloud sandboxes for AI agents, with Deep Research Agents, Computer Use Agents, and Secure MCPs. Plans start free.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to E2B

34

Promptfoo

AI security testing with red teaming, guardrails, and code scanning.

Promptfoo automates AI security testing with red teaming, guardrails, and code scanning. Community is Free Forever; Enterprise and On-Premise are custom.

Listedfree tier Security AI Agents

Repository not availableAlternatives to Promptfoo

35

pgvector

Vector similarity search inside Postgres for embeddings and relational data.

Pgvector adds vector search to Postgres with exact and approximate nearest-neighbor search. Plans run Free $0USDper user/month, Team $4USDper user/month, Enterprise $21USDper user/month.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to pgvector

36

NVIDIA NeMo Guardrails

Programmable guardrails for LLM inputs, outputs, and retrieved content.

NVIDIA NeMo Guardrails adds programmable LLM safety checks with Content Safety, PII Detection, and Topic Control. Open-source Python package on GitHub and PyPI.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to NVIDIA NeMo Guardrails

37

Chroma

AI search infrastructure with local-to-cloud retrieval and metadata filtering.

Chroma combines sparse, vector, and lexical search with metadata filtering. Plans start at $0/month on Starter.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Chroma

38

Goose (Block)

A local AI agent for code, research, writing, and automation.

Goose (Block) runs local AI workflows with 70+ MCP extensions, Recipes, and subagents across desktop, CLI, and API.

Listedfree tier Agent Frameworks

Repository not availableAlternatives to Goose (Block)

39

AGENTS.md

Open Markdown instructions that help coding agents follow repo rules.

AGENTS.md standardizes repo instructions for coding agents with setup commands, code style, and testing guidance across 60k+ projects.

Listedfree tier Coding Agents

Repository not availableAlternatives to AGENTS.md

40

Guardrails AI

Test, govern, and protect LLM apps before release.

Guardrails AI tests and protects LLM apps with simulation, evals, and runtime policy checks for any LLM and deployment option.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Guardrails AI

41

RAGAS

Open-source LLM evaluation for repeatable experiments and tracked results.

Ragas is an open-source LLM evaluation library with metrics, dataset management, and result tracking. Integrates with LangChain and Amazon Bedrock.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to RAGAS

42

Trigger.dev

Background jobs and AI workflows on managed workers.

Trigger.dev runs background jobs and AI workflows with managed workers, Realtime updates, and concurrency controls. Plans start at Free $0/month.

Listedfree tier Workflow Automation

Repository not availableAlternatives to Trigger.dev

43

SWE-bench

Benchmark language models on real GitHub issues with reproducible runs.

SWE-bench evaluates code-editing models on real GitHub issues with Docker-based reproducible runs and leaderboards used by OpenAI and Anthropic.

Listedfree tier Research Agents

Repository not availableAlternatives to SWE-bench

44

AutoGen

Framework for prototyping and shipping multi-agent apps.

MIT-licensed, 103k stars, active releases.

Listedfree tier103k starsMITAgent Frameworks

Repository not availableAlternatives to AutoGen

45

StackOne

Agent-to-app connectivity with managed auth and secure execution.

StackOne connects agents to 270+ integrations with managed auth, MCP, and 18,000+ actions. Starter is free; Core and Enterprise are custom.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to StackOne

46

LLM Guard

Open-source filters for safer prompts and model outputs.

LLM Guard filters prompts and outputs with scanners, CPU inference, and model-agnostic support across Azure OpenAI, Bedrock, and Langchain.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to LLM Guard

47

RunPod

GPU cloud for AI teams running training, inference, and agents.

RunPod provides GPU cloud for AI workloads, with Cloud GPUs, Serverless, and Clusters across 31 global regions. Pods: GPU is custom.

Listedfree tier AI Model Providers

Repository not availableAlternatives to RunPod

48

AgentBench

Open-source benchmark for reproducible LLM agent evaluation.

AgentBench benchmarks LLM agents with Function Calling and containerized tasks on Docker and Compose.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to AgentBench

49

ToolBench

Open platform for training and evaluating tool-using language models.

ToolBench is an open platform for tool-using models with Web Demo, Tool Eval, and 16,464 APIs. Plans start at Free $0/user/month.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to ToolBench

50

MetaGPT

Multi-agent software workflows for engineering teams inside GitHub.

MetaGPT coordinates code, reviews, and artifacts in GitHub with Multi-Agent Framework, Pull requests, and GitHub Actions. Plans start at $0/user/mo.

Listedfree tier Coding Agents

Repository not availableAlternatives to MetaGPT

51

LiveKit Agents

Build, deploy, and monitor realtime AI agents.

LiveKit Agents builds and monitors realtime AI agents with observability, session analytics, and deployment. Plans start at $0/mo.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to LiveKit Agents

52

Kite

AI-assisted coding that suggests snippets and completions in your editor.

Kite suggests code and relevant snippets inside the editor, with Python type inference and code search. It reached 500,000 monthly-active developers.

Listedfree tier Coding Agents

Repository not availableAlternatives to Kite

53

Inspect AI

Open-source framework for benchmarking models and agents.

Inspect AI benchmarks models and agents with Inspect View, tool calling, and structured output across 200+ evaluations.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Inspect AI

54

Crawl4AI

Open-source web crawling for LLM-ready outputs and browser control.

Crawl4AI turns web pages into clean Markdown and structured data with browser control; open source, self-hostable, and 65.7k stars on GitHub.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Crawl4AI

55

CAMEL-AI

Open-source framework for code-first, stateful agent workflows.

CAMEL-AI is an open-source agent framework for code-first orchestration, with Workforce, Connect to RL, and MCP support.

Listedfree tier Agent Frameworks

Repository not availableAlternatives to CAMEL-AI

56

TruLens

Open-source evaluation for AI agents with trace-level scoring.

TruLens traces AI agent behavior and scores groundedness, relevance, and coherence through Python SDK or OpenTelemetry traces.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to TruLens

57

UpTrain

LLM evaluation and improvement platform for testing, monitoring, and regression checks.

UpTrain evaluates LLM outputs, tests prompt changes, and monitors 1,000,000+ responses with open-source self-hosting.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to UpTrain

58

Hugging Face

A shared hub for models, datasets, and AI apps.

Hugging Face is an AI hub for models, datasets, and apps, with Spaces, Inference Providers, and Inference Endpoints. PRO starts at $9/month.

Listedfree tier AI Model Providers

Repository not availableAlternatives to Hugging Face

59

Gemma

Open models for generation, retrieval, and safety checks.

Gemma offers open models for text, audio, image, retrieval, and safety checks, with deployment across devices and cloud.

Listedfree tier AI Model Providers

Repository not availableAlternatives to Gemma

60

Qwen

AI models for multilingual translation, image editing, and moderation.

Qwen provides multilingual translation, image editing, and real-time safety moderation across GitHub, Hugging Face, ModelScope, Qwen Chat, and Qwen API.

Listedfree tier AI Model Providers

Repository not availableAlternatives to Qwen

61

01.AI Yi

Enterprise AI models for text, image, and code workloads.

Apache 2.0-licensed, 7.8k stars.

Listedfree tier7.8k starsApache 2.0AI Model Providers

Repository not availableAlternatives to 01.AI Yi

62

MiniMax

Multimodal AI for text, voice, agents, and deployable infrastructure.

MiniMax turns text, audio, video, and music into outputs with Agent Harness, coding APIs, and private cluster deployment.

Listedfree tier AI Model Providers

Repository not availableAlternatives to MiniMax

63

Replicate

AI model inference and fine-tuning through a simple API.

Replicate exposes AI models through an API for images, speech, video, and LLMs. Usage pricing starts at CPU (Small) $0.000025/sec.

Listedfree tier AI Model Providers

Repository not availableAlternatives to Replicate

64

CometChat

Embedded chat, voice/video, and AI conversations for product teams.

CometChat adds embedded chat, voice/video, and AI conversations with SDKs and UI kits. Plans start at $0/month; Enterprise starts from 10k MAU.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to CometChat

65

Hume AI

Voice AI for human feedback, expressive synthesis, and speech interaction.

Hume AI combines Human Feedback API studies, voice cloning, and expressive speech generation across 50+ languages and 48+ emotions.

Listedfree tier Voice AI Agents

Repository not availableAlternatives to Hume AI

66

Vertex AI Agent Builder

Google Cloud platform for building and governing enterprise AI agents.

Vertex AI Agent Builder builds and governs enterprise AI agents, with BigQuery, Pub/Sub, and API integration. Plans: Free, Pay as you go, Custom.

Listedfree tier Agent Frameworks

Repository not availableAlternatives to Vertex AI Agent Builder

67

CrewAI

Orchestrate collaborative AI agent workflows with visual control and APIs.

CrewAI orchestrates AI agents with visual workflows, tracing, and a REST API. Pro Plan is $99/month; Enterprise is custom.

Listedfree tier Agent Frameworks

Repository not availableAlternatives to CrewAI

68

AutoGPT

Open-source AI assistants for continuous workflow automation.

AutoGPT automates digital workflows with continuous agents and low-code workflows. Free $0; Pro custom.

Listedfree tier Workflow Automation

Repository not availableAlternatives to AutoGPT

69

Smithery

Connect AI agents to tools, auth, and reusable workflows.

Smithery connects AI agents to tools with Managed OAuth and 8,841+ MCPs. Plans run Free, Pro $20/month, and Enterprise custom.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Smithery

70

Mastra

TypeScript framework for building, observing, and deploying AI agents.

Mastra is a TypeScript framework for AI agents with Observability, Studio, and Memory Gateway. Plans run Free, Pro custom, and Enterprise custom.

Listedfree tier Agent Tools & Integrations

Repository not availableAlternatives to Mastra

71

LangGraph

Framework for reliable AI agents with low-level control.

LangGraph builds reliable AI agents with Observability and Evaluation, starting Free and scaling to Pro at $99/month.

Listedfree tier Agent Frameworks

Repository not availableAlternatives to LangGraph

72

n8n

Open-source workflow automation with visual builds and self-hosting.

N8n automates workflows with visual builders, custom API connections, and self-hosting. Plans start at $20/mo.

Listedfree tier Workflow Automation

Repository not availableAlternatives to n8n

Open Source AI Tools (2026) 72

GitHub momentum leaders

Editor's picks

Common questions

Are all of these tools AGPL-free?

Which open-source AI agent has the most stars?

How do you pick which open-source tools to list?