Are all of these tools AGPL-free?

3 of the listed tools use AGPL. The rest are mostly MIT (19) and Apache 2.0 (20), which are permissive. Check each listing's license before shipping commercially.

Which open-source AI agent has the most stars?

ECC leads with 279k 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.

Featured

Your brand here — Reach readers browsing the index for AI agents.

Advertise on AgentsIndex

Open Source AI Tools (2026) 76

76 open-source AI agents with public GitHub repositories, including Arize Phoenix, Open WebUI, Zep. Self-host, fork, or contribute.

Last updated: October 14, 2026

Reviewed by AgentsIndex · Updated Oct 14, 2026

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

GitHub momentum leaders

Top by stars

1. ECC — 279k stars
2. Hermes Agent — 253k stars
3. n8n — 207k stars
4. Firecrawl — 191k stars
5. AutoGPT — 188k stars

Most recent releases

License mix: Apache 2.0 (20), MIT (19), NOASSERTION (5), AGPL (3), CC-BY-4.0 (1), BSD (1). All listed tools are viewable on GitHub.

Editor's picks

Best for agent tools & integrations

ECC

279k GitHub stars, free tier, paid from $19/month

Best for agent frameworks

Hermes Agent

253k 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

91k GitHub stars, free tier, paid from $29/month

Best for workflow automation

n8n

207k GitHub stars, free tier, paid from $20/month

1

Arize Phoenix

Open-source tracing and evaluation for agent workflows.

NOASSERTION-licensed, 12k stars, active releases.

Listedfree tier12k starsNOASSERTIONAgent Tools & Integrations

View on GitHub

2

Open WebUI

Self-hosted AI workspace for chat, files, search, and multimodal work.

154k stars, active releases.

Listedfree tier154k starsAgent Tools & Integrations

View on GitHub

3

Zep

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

Apache 2.0-licensed, 5k stars, active releases.

Listedfree tier5k starsApache 2.0Agent Tools & Integrations

View on GitHub

4

Langflow

Visual AI app and agent builder with Python flexibility.

MIT-licensed, 155k stars, active releases.

Listedfree tier155k starsMITNo-Code/Low-Code Builders

View on GitHub

5

Cline

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

Apache 2.0-licensed, 70k stars, active releases.

Listedfree tier70k starsApache 2.0Coding Agents

View on GitHub

6

Semantic Kernel

A framework that turns prompts and APIs into function calls.

MIT-licensed, 29k stars, active releases.

Listedfree tier29k starsMITAgent Frameworks

View on GitHub

7

Pilot Protocol

Direct peer-to-peer networking for AI agents with trust handshakes.

AGPL-licensed, 147 stars, active releases.

Listedfree tier147 starsAGPLAgent Tools & Integrations

View on GitHub

8

MetaGPT

Multi-agent software workflows for engineering teams inside GitHub.

MIT-licensed, 71k stars, last release 8 months ago.

Listedfree tier71k starsMITCoding Agents

View on GitHub

9

CrewAI

Orchestrate collaborative AI agent workflows with visual control and APIs.

MIT-licensed, 60k stars, active releases.

Listedfree tier60k starsMITAgent Frameworks

View on GitHub

10

TruLens

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

MIT-licensed, 3.6k stars, active releases.

Listedfree tier3.6k starsMITAgent Tools & Integrations

View on GitHub

11

LangGraph

Framework for reliable AI agents with low-level control.

MIT-licensed, 43k stars, active releases.

Listedfree tier43k starsMITAgent Frameworks

View on GitHub

12

AutoGPT

Open-source AI assistants for continuous workflow automation.

188k stars, active releases.

Listedfree tier188k starsWorkflow Automation

View on GitHub

13

Tale

Open-source workspace for coordinating agents, files, and approvals.

Tale coordinates AI agents, files, and approvals in one workspace. Community is free; Enterprise is CHF 12 per user/month.

Listedfree tier Workflow Automation

Repository not available

14

TameDuck

Open-source AI teammates with their own cloud Linux computers.

TameDuck runs AI teammates with browser automation, approvals, and a skills library. A €1 trial runs 7 days (+VAT), then auto-renews to €49/month (+VAT) unless cancelled.

Listedfree tier Browser Agents

Repository not available

15

Trigger.dev

Background jobs and AI workflows on managed workers.

Apache 2.0-licensed, 17k stars, active releases.

Listedfree tier17k starsApache 2.0Workflow Automation

View on GitHub

16

pgvector

Vector similarity search inside Postgres for embeddings and relational data.

23k stars, active releases.

Listedfree tier23k starsAgent Tools & Integrations

View on GitHub

17

Milvus

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

Apache 2.0-licensed, 46k stars, active releases.

Listedfree tier46k starsApache 2.0Agent Tools & Integrations

View on GitHub

18

LiveKit Agents

Build, deploy, and monitor realtime AI agents.

Apache 2.0-licensed, 15k stars, active releases.

Listedfree tier15k starsApache 2.0Agent Tools & Integrations

View on GitHub

19

RAGAS

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

Apache 2.0-licensed, 16k stars, last release 7 months ago.

Listedfree tier16k starsApache 2.0Agent Tools & Integrations

View on GitHub

20

PydanticAI

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

MIT-licensed, 21k stars, active releases.

Listedfree tier21k starsMITAgent Frameworks

View on GitHub

21

Inspect AI

Open-source framework for benchmarking models and agents.

MIT-licensed, 3k stars, active releases.

Listedfree tier3k starsMITAgent Tools & Integrations

View on GitHub

22

ECC

Open-source agent governance for consistent repo workflows.

MIT-licensed, 279k stars, active releases.

Listedfree tier279k starsMITAgent Tools & Integrations

View on GitHub

23

Langfuse

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

36k stars, active releases.

Listedfree tier36k starsAgent Tools & Integrations

View on GitHub

24

Crawl4AI

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

Apache 2.0-licensed, 85k stars, active releases.

Listedfree tier85k starsApache 2.0Agent Tools & Integrations

View on GitHub

25

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 available

26

Guardrails AI

Test, govern, and protect LLM apps before release.

Apache 2.0-licensed, 7.5k stars, active releases.

Listedfree tier7.5k starsApache 2.0Agent Tools & Integrations

View on GitHub

27

Firecrawl

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

AGPL-licensed, 191k stars, active releases.

Listedfree tier191k starsAGPLAgent Tools & Integrations

View on GitHub

28

Agno

Python agent framework and runtime with FastAPI scaffolding.

Apache 2.0-licensed, 43k stars, active releases.

Listedfree tier43k starsApache 2.0Agent Frameworks

View on GitHub

29

AutoGen

Framework for prototyping and shipping multi-agent apps, now in Microsoft's maintenance mode.

CC-BY-4.0-licensed, 61k stars, last release 6 months ago.

Listedfree tier61k starsCC-BY-4.0Agent Frameworks

View on GitHub

30

Browser Use

Browser automation that turns instructions into structured outputs.

MIT-licensed, 118k stars, active releases.

Listedfree tier118k starsMITBrowser Agents

View on GitHub

31

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 available

32

Haystack

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

Apache 2.0-licensed, 27k stars, active releases.

Listedfree tier27k starsApache 2.0Agent Frameworks

View on GitHub

33

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 available

34

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 available

35

SWE-agent

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

MIT-licensed, 21k stars, active releases.

Listedfree tier21k starsMITCoding Agents

View on GitHub

36

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 available

37

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 available

38

AIAgentSkills

Searchable directory for reusable agent skills and installable capabilities.

1 stars, active releases.

Listedfree tier1 starsAgent Tools & Integrations

View on GitHub

39

Goose (Block)

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

Apache 2.0-licensed, 55k stars, active releases.

Listedfree tier55k starsApache 2.0Agent Frameworks

View on GitHub

40

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 available

41

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 available

42

Opik

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

Apache 2.0-licensed, 23k stars, active releases.

Listedfree tier23k starsApache 2.0Agent Tools & Integrations

View on GitHub

43

Chroma

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

Apache 2.0-licensed, 29k stars, active releases.

Listedfree tier29k starsApache 2.0Agent Tools & Integrations

View on GitHub

44

Qdrant

Vector database for AI search with hybrid retrieval and filtering.

Apache 2.0-licensed, 35k stars, active releases.

Listedfree tier35k starsApache 2.0Agent Tools & Integrations

View on GitHub

45

HOL Guard

Policy enforcement for AI agents that checks risky actions before execution.

Apache 2.0-licensed, 877 stars, active releases.

Listedfree tier877 starsApache 2.0Security AI Agents

View on GitHub

46

Dify

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

158k stars, active releases.

Listedfree tier158k starsNo-Code/Low-Code Builders

View on GitHub

47

OpenHands

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

MIT-licensed, 91k stars, active releases.

Listedfree tier91k starsMITCoding Agents

View on GitHub

48

Mastra

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

29k stars, active releases.

Listedfree tier29k starsAgent Tools & Integrations

View on GitHub

49

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 available

50

Orkas

Local-first desktop workspace for coordinated AI agents and reviewed deliverables.

Orkas coordinates AI agents in a local-first workspace with Commander scheduling, reusable skills, and model flexibility. Plans start Free.

Listedfree tier Agent Frameworks

Repository not available

51

LiteLLM

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

NOASSERTION-licensed, 61k stars, active releases.

Listedfree tier61k starsNOASSERTIONAgent Tools & Integrations

View on GitHub

52

E2B

Cloud sandboxes for AI agents to run code and tools.

Apache 2.0-licensed, 14k stars, active releases.

Listedfree tier14k starsApache 2.0Agent Tools & Integrations

View on GitHub

53

Flowise

Open-source visual builder for AI agents and workflows.

NOASSERTION-licensed, 55k stars, active releases.

Listedfree tier55k starsNOASSERTIONNo-Code/Low-Code Builders

View on GitHub

54

LLM Guard

Open-source filters for safer prompts and model outputs.

MIT-licensed, 3.2k stars, active releases.

Listedfree tier3.2k starsMITAgent Tools & Integrations

View on GitHub

55

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 available

56

Stagehand

Open source browser automation with deterministic and agentic flows.

MIT-licensed, 26k stars, active releases.

Listedfree tier26k starsMITBrowser Agents

View on GitHub

57

NVIDIA NeMo Guardrails

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

NOASSERTION-licensed, 7.3k stars, active releases.

Listedfree tier7.3k starsNOASSERTIONAgent Tools & Integrations

View on GitHub

58

n8n

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

207k stars, active releases.

Listedfree tier207k starsWorkflow Automation

View on GitHub

59

Playwright MCP

Official browser automation for AI agents and web workflows.

Playwright MCP adds controlled browser automation for AI agents. Microsoft publishes it under Apache-2.0 with no paid plans.

Listedfree tier Browser Agents

Repository not available

60

Weaviate

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

BSD-licensed, 17k stars, active releases.

Listedfree tier17k starsBSDAgent Tools & Integrations

View on GitHub

61

CAMEL-AI

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

Apache 2.0-licensed, 18k stars, active releases.

Listedfree tier18k starsApache 2.0Agent Frameworks

View on GitHub

62

Base2026

Searchable, attributed evidence records from public expert videos.

Base2026 turns expert videos into searchable evidence records with a read-only API and MCP server. Public layer: 2,275 documents.

Listedfree tier Research Agents

Repository not available

63

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 available

64

LlamaIndex

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

MIT-licensed, 52k stars, active releases.

Listedfree tier52k starsMITAgent Tools & Integrations

View on GitHub

65

Aider

Terminal AI coding assistant that edits code in context.

Apache 2.0-licensed, 50k stars, last release 4 months ago.

Listedfree tier50k starsApache 2.0Coding Agents

View on GitHub

66

Activepieces

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

NOASSERTION-licensed, 25k stars, active releases.

Listedfree tier25k starsNOASSERTIONWorkflow Automation

View on GitHub

67

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 available

68

Promptfoo

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

MIT-licensed, 26k stars, active releases.

Listedfree tier26k starsMITSecurity AI Agents

View on GitHub

69

Skyvern

Open-source browser automation for login-heavy workflows.

AGPL-licensed, 23k stars, active releases.

Listedfree tier23k starsAGPLBrowser Agents

View on GitHub

70

Hermes Agent

Open-source AI workspace for chat, email, and terminal workflows.

MIT-licensed, 253k stars, active releases.

Listedfree tier253k starsMITAgent Frameworks

View on GitHub

71

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

View on GitHub

72

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 available

73

Agency Swarm

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

MIT-licensed, 4.6k stars, active releases.

Listedfree tier4.6k starsMITAgent Frameworks

View on GitHub

74

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 available

75

UpTrain

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

Apache 2.0-licensed, 2.4k stars.

Listedfree tier2.4k starsApache 2.0Agent Tools & Integrations

View on GitHub

76

ClineFlow

Open-source, Git-native project memory for AI coding agents.

MIT-licensed, 1 stars, active releases.

Certified1 starsMITAgent Tools & Integrations

View on GitHub

Featured

Your brand here

Reach readers browsing the index for AI agents.

Advertise on AgentsIndex

Featured

Featured listings:

Open Source AI Tools (2026) 76

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?