Open Source AI Tools (2026) 75

2

Dify

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

158k stars, active releases.

Listedfree tier158k starsNo-Code/Low-Code Builders

3

Flowise

Open-source visual builder for AI agents and workflows.

NOASSERTION-licensed, 55k stars, active releases.

Listedfree tier55k starsNOASSERTIONNo-Code/Low-Code Builders

4

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

5

Aider

Terminal AI coding assistant that edits code in context.

Apache 2.0-licensed, 49k stars, last release 4 months ago.

Listedfree tier49k starsApache 2.0Coding Agents

6

Agency Swarm

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

MIT-licensed, 4.6k stars, active releases.

Listedfree tier4.6k starsMITAgent Frameworks

7

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

8

Skyvern

Open-source browser automation for login-heavy workflows.

AGPL-licensed, 23k stars, active releases.

Listedfree tier23k starsAGPLBrowser Agents

9

LLM Guard

Open-source filters for safer prompts and model outputs.

MIT-licensed, 3.2k stars, active releases.

Listedfree tier3.2k starsMITAgent Tools & Integrations

10

HOL Guard

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

Apache 2.0-licensed, 664 stars, active releases.

Listedfree tier664 starsApache 2.0Security AI Agents

11

AIAgentSkills

Searchable directory for reusable agent skills and installable capabilities.

1 stars, active releases.

Listedfree tier1 starsAgent Tools & Integrations

12

LiteLLM

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

NOASSERTION-licensed, 58k stars, active releases.

Listedfree tier58k starsNOASSERTIONAgent Tools & Integrations

13

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

14

Promptfoo

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

MIT-licensed, 25k stars, active releases.

Listedfree tier25k starsMITSecurity AI Agents

15

NVIDIA NeMo Guardrails

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

NOASSERTION-licensed, 7.1k stars, active releases.

Listedfree tier7.1k starsNOASSERTIONAgent Tools & Integrations

16

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

17

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

18

LangGraph

Framework for reliable AI agents with low-level control.

MIT-licensed, 42k stars, active releases.

Listedfree tier42k starsMITAgent Frameworks

19

CrewAI

Orchestrate collaborative AI agent workflows with visual control and APIs.

MIT-licensed, 59k stars, active releases.

Listedfree tier59k starsMITAgent Frameworks

20

n8n

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

204k stars, active releases.

Listedfree tier204k starsWorkflow Automation

21

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

22

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

23

Opik

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

Apache 2.0-licensed, 22k stars, active releases.

Listedfree tier22k starsApache 2.0Agent Tools & Integrations

24

Weaviate

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

BSD-licensed, 17k stars, active releases.

Listedfree tier17k starsBSDAgent Tools & Integrations

25

MetaGPT

Multi-agent software workflows for engineering teams inside GitHub.

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

Listedfree tier71k starsMITCoding Agents

26

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

27

pgvector

Vector similarity search inside Postgres for embeddings and relational data.

23k stars, active releases.

Listedfree tier23k starsAgent Tools & Integrations

28

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

29

OpenHands

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

MIT-licensed, 90k stars, active releases.

Listedfree tier90k starsMITCoding Agents

30

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

31

ClineFlow

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

MIT-licensed, 1 stars, active releases.

Certified1 starsMITAgent Tools & Integrations

32

Open WebUI

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

154k stars, active releases.

Listedfree tier154k starsAgent Tools & Integrations

33

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

34

Stagehand

Open source browser automation with deterministic and agentic flows.

MIT-licensed, 26k stars, active releases.

Listedfree tier26k starsMITBrowser Agents

35

Trigger.dev

Background jobs and AI workflows on managed workers.

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

Listedfree tier16k starsApache 2.0Workflow Automation

36

TruLens

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

MIT-licensed, 3.6k stars, active releases.

Listedfree tier3.6k starsMITAgent Tools & Integrations

37

Inspect AI

Open-source framework for benchmarking models and agents.

MIT-licensed, 2.9k stars, active releases.

Listedfree tier2.9k starsMITAgent Tools & Integrations

38

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

39

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

40

LiveKit Agents

Build, deploy, and monitor realtime AI agents.

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

Listedfree tier15k starsApache 2.0Agent Tools & Integrations

41

Langfuse

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

35k stars, active releases.

Listedfree tier35k starsAgent Tools & Integrations

42

Arize Phoenix

Open-source tracing and evaluation for agent workflows.

NOASSERTION-licensed, 12k stars, active releases.

Listedfree tier12k starsNOASSERTIONAgent Tools & Integrations

43

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

44

LlamaIndex

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

MIT-licensed, 52k stars, active releases.

Listedfree tier52k starsMITAgent Tools & Integrations

45

Mastra

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

29k stars, active releases.

Listedfree tier29k starsAgent Tools & Integrations

46

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

47

Hermes Agent

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

MIT-licensed, 251k stars, active releases.

Listedfree tier251k starsMITAgent Frameworks

48

ECC

Open-source agent governance for consistent repo workflows.

MIT-licensed, 274k stars, active releases.

Listedfree tier274k starsMITAgent Tools & Integrations

49

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

50

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

51

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

52

Semantic Kernel

A framework that turns prompts and APIs into function calls.

MIT-licensed, 29k stars, active releases.

Listedfree tier29k starsMITAgent Frameworks

53

PydanticAI

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

MIT-licensed, 20k stars, active releases.

Listedfree tier20k starsMITAgent Frameworks

54

SWE-agent

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

MIT-licensed, 20k stars, active releases.

Listedfree tier20k starsMITCoding Agents

55

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

56

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

57

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

58

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

59

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

60

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

61

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

62

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

63

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

64

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

65

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

66

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

67

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

68

Firecrawl

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

AGPL-licensed, 189k stars, active releases.

Listedfree tier189k starsAGPLAgent Tools & Integrations

69

AutoGPT

Open-source AI assistants for continuous workflow automation.

188k stars, active releases.

Listedfree tier188k starsWorkflow Automation

70

Pilot Protocol

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

AGPL-licensed, 146 stars, active releases.

Listedfree tier146 starsAGPLAgent Tools & Integrations

71

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

72

Agno

Python agent framework and runtime with FastAPI scaffolding.

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

Listedfree tier43k starsApache 2.0Agent Frameworks

73

Browser Use

Browser automation that turns instructions into structured outputs.

MIT-licensed, 117k stars, active releases.

Listedfree tier117k starsMITBrowser Agents

74

Activepieces

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

NOASSERTION-licensed, 25k stars, active releases.

Listedfree tier25k starsNOASSERTIONWorkflow Automation

75

Langflow

Visual AI app and agent builder with Python flexibility.

MIT-licensed, 156k stars, active releases.

Listedfree tier156k starsMITNo-Code/Low-Code Builders