Open Source AI Tools (2026) 69

2

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

3

Zep

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

Apache 2.0-licensed, 4.9k stars, active releases.

Listedfree tier4.9k starsApache 2.0Agent Tools & Integrations

4

Weaviate

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

BSD-licensed, 17k stars, active releases.

Listedfree tier17k starsBSDAgent Tools & Integrations

5

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

6

CrewAI

Orchestrate collaborative AI agent workflows with visual control and APIs.

MIT-licensed, 57k stars, active releases.

Listedfree tier57k starsMITAgent Frameworks

7

Semantic Kernel

A framework that turns prompts and APIs into function calls.

MIT-licensed, 28k stars, active releases.

Listedfree tier28k starsMITAgent Frameworks

8

PydanticAI

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

MIT-licensed, 19k stars, active releases.

Listedfree tier19k starsMITAgent Frameworks

9

SWE-agent

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

MIT-licensed, 20k stars, active releases.

Listedfree tier20k starsMITCoding Agents

10

AutoGen

Framework for prototyping and shipping multi-agent apps.

CC-BY-4.0-licensed, 60k stars, last release 4 months ago.

Listedfree tier60k starsCC-BY-4.0Agent Frameworks

11

LLM Guard

Open-source filters for safer prompts and model outputs.

MIT-licensed, 3.2k stars, active releases.

Listedfree tier3.2k starsMITAgent Tools & Integrations

12

AIAgentSkills

Searchable directory for reusable agent skills and installable capabilities.

1 stars, active releases.

Listedfree tier1 starsAgent Tools & Integrations

13

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.

Repository not available

14

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.

Repository not available

15

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.

Repository not available

16

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.

Repository not available

17

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.

Repository not available

18

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

19

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.

Repository not available

20

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.

Repository not available

21

Flowise

Open-source visual builder for AI agents and workflows.

NOASSERTION-licensed, 55k stars, active releases.

Listedfree tier55k starsNOASSERTIONNo-Code/Low-Code Builders

22

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

23

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 available

24

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.

Repository not available

25

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.

Repository not available

26

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.

Repository not available

27

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

28

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

29

OpenHands

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

MIT-licensed, 84k stars, active releases.

Listedfree tier84k starsMITCoding Agents

30

Dify

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

152k stars, active releases.

Listedfree tier152k starsNo-Code/Low-Code Builders

31

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

32

Guardrails AI

Test, govern, and protect LLM apps before release.

Apache 2.0-licensed, 7.3k stars, active releases.

Listedfree tier7.3k starsApache 2.0Agent Tools & Integrations

33

RAGAS

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

Apache 2.0-licensed, 15k stars, last release 5 months ago.

Listedfree tier15k starsApache 2.0Agent Tools & Integrations

34

Firecrawl

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

AGPL-licensed, 167k stars, active releases.

Listedfree tier167k starsAGPLAgent Tools & Integrations

35

Stagehand

Open source browser automation with deterministic and agentic flows.

MIT-licensed, 24k stars, active releases.

Listedfree tier24k starsMITBrowser Agents

36

LlamaIndex

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

MIT-licensed, 52k stars, active releases.

Listedfree tier52k starsMITAgent Tools & Integrations

37

Cline

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

Apache 2.0-licensed, 66k stars, active releases.

Listedfree tier66k starsApache 2.0Coding Agents

38

Mastra

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

27k stars, active releases.

Listedfree tier27k starsAgent Tools & Integrations

39

AutoGPT

Open-source AI assistants for continuous workflow automation.

187k stars, active releases.

Listedfree tier187k starsWorkflow Automation

40

n8n

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

201k stars, active releases.

Listedfree tier201k starsWorkflow Automation

41

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

42

Langfuse

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

33k stars, active releases.

Listedfree tier33k starsAgent Tools & Integrations

43

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

44

LangGraph

Framework for reliable AI agents with low-level control.

MIT-licensed, 40k stars, active releases.

Listedfree tier40k starsMITAgent Frameworks

45

Routeweiler

Open-source client for routing paid API calls across payment rails.

Apache 2.0-licensed, 31 stars, active releases.

Listedfree tier31 starsApache 2.0Agent Tools & Integrations

46

Aider

Terminal AI coding assistant that edits code in context.

Apache 2.0-licensed, 48k stars, active releases.

Listedfree tier48k starsApache 2.0Coding Agents

47

Goose (Block)

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

Apache 2.0-licensed, 53k stars, active releases.

Listedfree tier53k starsApache 2.0Agent Frameworks

48

Pilot Protocol

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

AGPL-licensed, 133 stars, active releases.

Listedfree tier133 starsAGPLAgent Tools & Integrations

49

Haystack

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

Apache 2.0-licensed, 26k stars, active releases.

Listedfree tier26k starsApache 2.0Agent Frameworks

50

Agno

Python agent framework and runtime with FastAPI scaffolding.

Apache 2.0-licensed, 42k stars, active releases.

Listedfree tier42k starsApache 2.0Agent Frameworks

51

Agency Swarm

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

MIT-licensed, 4.5k stars, active releases.

Listedfree tier4.5k starsMITAgent Frameworks

52

Skyvern

Open-source browser automation for login-heavy workflows.

AGPL-licensed, 23k stars, active releases.

Listedfree tier23k starsAGPLBrowser Agents

53

Browser Use

Browser automation that turns instructions into structured outputs.

MIT-licensed, 110k stars, active releases.

Listedfree tier110k starsMITBrowser Agents

54

Activepieces

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

NOASSERTION-licensed, 24k stars, active releases.

Listedfree tier24k starsNOASSERTIONWorkflow Automation

55

Langflow

Visual AI app and agent builder with Python flexibility.

MIT-licensed, 153k stars, active releases.

Listedfree tier153k starsMITNo-Code/Low-Code Builders

56

Arize Phoenix

Open-source tracing and evaluation for agent workflows.

NOASSERTION-licensed, 11k stars, active releases.

Listedfree tier11k starsNOASSERTIONAgent Tools & Integrations

57

LiteLLM

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

NOASSERTION-licensed, 57k stars, active releases.

Listedfree tier57k starsNOASSERTIONAgent Tools & Integrations

58

Opik

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

Apache 2.0-licensed, 21k stars, active releases.

Listedfree tier21k starsApache 2.0Agent Tools & Integrations

59

Qdrant

Vector database for AI search with hybrid retrieval and filtering.

Apache 2.0-licensed, 34k stars, active releases.

Listedfree tier34k starsApache 2.0Agent Tools & Integrations

60

Promptfoo

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

MIT-licensed, 24k stars, active releases.

Listedfree tier24k starsMITSecurity AI Agents

61

NVIDIA NeMo Guardrails

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

NOASSERTION-licensed, 7k stars, active releases.

Listedfree tier7k starsNOASSERTIONAgent Tools & Integrations

62

E2B

Cloud sandboxes for AI agents to run code and tools.

Apache 2.0-licensed, 13k stars, active releases.

Listedfree tier13k starsApache 2.0Agent Tools & Integrations

63

Trigger.dev

Background jobs and AI workflows on managed workers.

Apache 2.0-licensed, 16k stars, active releases.

Listedfree tier16k starsApache 2.0Workflow Automation

64

TruLens

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

MIT-licensed, 3.5k stars, active releases.

Listedfree tier3.5k starsMITAgent Tools & Integrations

65

Inspect AI

Open-source framework for benchmarking models and agents.

MIT-licensed, 2.6k stars, active releases.

Listedfree tier2.6k starsMITAgent Tools & Integrations

66

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

67

MetaGPT

Multi-agent software workflows for engineering teams inside GitHub.

MIT-licensed, 70k stars, last release 7 months ago.

Listedfree tier70k starsMITCoding Agents

68

LiveKit Agents

Build, deploy, and monitor realtime AI agents.

Apache 2.0-licensed, 13k stars, active releases.

Listedfree tier13k starsApache 2.0Agent Tools & Integrations

69

Crawl4AI

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

Apache 2.0-licensed, 79k stars, active releases.

Listedfree tier79k starsApache 2.0Agent Tools & Integrations