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  1. Home
  2. Best Tools
  3. Best Open Source AI Tools

Best Open Source AI Tools

Discover the best open source tools for AI development, from LLMs to vector databases.

Next.js logo
Next.js

Frontend· nextjs.org

Open source

React framework for production web apps, dashboards, and SaaS products.

142,267
Open source

Frequently Asked Questions

What are the best open source ai tools?

tokens& tracks open source ai tools with product fit, docs, pricing, alternatives, open source status, public proof, and adoption evidence where available.

How do we rank open source ai tools?

Catalog ordering uses available stars, reviews, benchmarks, funding, featured status, saves, adoption-event counts, and product metadata. Those event counts do not establish verified adoption or retention. AgentRank is a separate ranking with its own published methodology. Sponsored suggestions, when present, are labeled.

For adoption evidence, see AgentRank rankings and the published methodology.

Supabase logo
Supabase

Backend & Database· supabase.com

Freemium

Postgres, auth, storage, realtime, and vector extensions for app backends.

109,092
Open source
LlamaIndex logo
LlamaIndex

RAG Frameworks· llamaindex.ai

Open source

Data framework for document ingestion, retrieval, and RAG over private data.

52,139
Open source
CrewAI logo
CrewAI

AI Agents· crewai.com

Open source

Open-source framework for multi-agent workflows and role-based agents.

58,422
Open source
Firecrawl logo
Firecrawl

RAG Frameworks· firecrawl.dev

Freemium

Web data API and open-source crawling stack for turning sites into clean markdown, structured data, and agent-ready content for RAG and automation pipelines.

179,620
Open source
Open WebUI logo
Open WebUI

AI Agents· openwebui.com

Open source

Open-source self-hosted AI interface and app platform for model routing, local or hosted LLM workflows, and OpenRouter-compatible chat apps.

143,623
Open source
ComfyUI logo
ComfyUI

AI Agents· comfy.org

Open source

The modular AI image and workflow backend for builders shipping node-based generation pipelines, custom diffusion apps, and visual automation.

119,089
Open source
Langflow logo
Langflow

Agent Frameworks· langflow.org

Open source

Visual Python framework for building and deploying agentic and RAG applications with reusable components and API endpoints.

150,154
Open source
Microsoft MarkItDown logo
Microsoft MarkItDown

RAG Frameworks· github.com

Open source

Microsoft MarkItDown is an open-source document conversion tool that turns files and office documents into Markdown for LLM, RAG, and text-analysis pipelines.

162,770
Open source
Dify logo
Dify

Agent Frameworks· dify.ai

Freemium

Open-source platform for building agentic workflows, RAG apps, and LLM application backends.

146,650
Open source
n8n logo
n8n

Agent Frameworks· n8n.io

Freemium

Source-available workflow automation platform for building AI agent workflows, tool integrations, and production automations across APIs and apps.

194,717
Open source
opencode logo
opencode

AI Agents· opencode.ai

Open source

Open-source terminal coding agent for delegating software changes across local repositories and multiple LLM providers.

180,811
Open source
Browser Use logo
Browser Use

AI Agents· browser-use.com

Freemium

Browser automation framework and managed browser infrastructure for web agents, with an open-source library and hosted cloud execution.

99,856
Open source
Gemini CLI logo
Gemini CLI

AI Agents· github.com

Open source

Open-source terminal AI agent that brings Gemini-assisted coding and automation into developer shells.

105,670
Open source
Langfuse logo
Langfuse

Observability· langfuse.com

Freemium

Open-source LLM engineering platform for tracing, evals, prompt management, and metrics so teams can debug and improve production AI applications.

34,515
Open source
Pathway logo
Pathway

RAG Frameworks· pathway.com

Freemium

Python framework for streaming ETL, real-time analytics, LLM pipelines, and live RAG systems.

62,773
Open source
santifer/career-ops logo
santifer/career-ops

AI Agents· career-ops.org

Open source

AI-powered job search system built on Claude Code. 14 skill modes, Go dashboard, PDF generation, batch processing.

57,241
Open source
Cline logo
Cline

AI Agents· cline.bot

Open source

Autonomous coding agent available as an IDE extension, SDK, and CLI for builders who want agentic coding workflows tied to repo context.

67,900
Open source
Context7 logo
Context7

RAG Frameworks· context7.com

Freemium

Up-to-date, version-specific documentation retrieval for AI coding agents through MCP and API workflows.

61,941
Open source
Daytona logo
Daytona

Cloud Deploy· daytona.io

Freemium

Secure sandbox infrastructure for running AI-generated code and agent workloads with isolated, stateful environments, fast startup, and SDK control over files, git, and processes.

71,723
Open source
shareAI-lab/learn-claude-code logo
shareAI-lab/learn-claude-code

AI Agents· learn.shareai.run

Open source

Bash is all you need - A nano claude code–like 「agent harness」, built from 0 to 1

69,538
Open source
HKUDS/nanobot logo
HKUDS/nanobot

AI Agents· nanobot.wiki

Open source

Ultra-lightweight, open-source, self-hosted personal AI agent framework in Python with WebUI, tools, memory, MCP, multi-agent workflows, automation, and chat apps

Mcp
46,606
Open source
Haystack logo
Haystack

RAG Frameworks· haystack.deepset.ai

Open source

Open-source framework for production LLM applications, RAG pipelines, search, and agentic workflows.

25,642
Open source
LangGraph logo
LangGraph

AI Agents· langchain.com

Open source

Low-level orchestration framework for building stateful, long-running AI agents and agent workflows.

35,516
Open source
LightRAG logo
LightRAG

RAG Frameworks· lightrag.github.io

Open source

LightRAG is a graph-based retrieval framework and API server for building fast knowledge-graph RAG systems that combine vector and graph retrieval.

37,295
Open source
Playwright MCP logo
Playwright MCP

AI Agents· github.com

Open source

Official Microsoft MCP server that gives AI agents structured browser automation through Playwright.

34,327
Open source
Chrome DevTools MCP logo
Chrome DevTools MCP

Frontend· developer.chrome.com

Open source

Official Chrome DevTools MCP server for browser inspection, debugging, automation, and performance analysis from coding agents.

43,761
Open source
Claude Code Router logo
Claude Code Router

LLM APIs· github.com

Open source

Open-source router for Claude Code that lets builders route coding-agent requests across OpenAI-compatible model providers and custom backends.

35,475
Open source
CopilotKit logo
CopilotKit

Frontend· copilotkit.ai

Freemium

Frontend stack for embedding agents, generative UI, and AG-UI workflows in applications.

35,535
Open source
GitHub MCP Server logo
GitHub MCP Server

AI Agents· docs.github.com

Open source

Official GitHub MCP server that lets AI agents read repositories, manage issues and pull requests, and automate GitHub workflows.

32,902
Open source
Tabby logo
Tabby

AI Agents· tabbyml.com

Open source

Self-hosted AI coding assistant for code completion, chat, and team-managed developer workflows.

33,678
Open source
Onyx logo
Onyx

RAG Frameworks· onyx.app

Open source

Open-source AI knowledge platform for enterprise search, chat, connectors, and RAG over internal data.

30,726
Open source
Supermemory logo
Supermemory

RAG Frameworks· supermemory.ai

Freemium

Memory and context API for adding long-term recall, RAG, and user profiles to AI agents.

27,624
Open source
pgvector logo
pgvector

Vector Databases· github.com

Open source

Open-source PostgreSQL extension for vector similarity search, embeddings storage, and production RAG retrieval inside Postgres.

21,963
Open source
MLflow logo
MLflow

Observability· mlflow.org

Open source

MLflow is an open-source AI engineering platform with GenAI evaluation, tracing, monitoring, and optimization workflows for agents, LLM apps, and models.

26,852
Open source
Skyvern logo
Skyvern

AI Agents· skyvern.com

Freemium

AI browser automation platform for workflows that need computer-use style web actions, extraction, and hosted or self-hosted agents.

22,018
Open source
DB-GPT logo
DB-GPT

RAG Frameworks· dbgpt.site

Open source

Open-source AI-native data app framework for text-to-SQL, RAG over databases, and private data agents.

19,943
Open source
Kotaemon logo
Kotaemon

RAG Frameworks· cinnamon.github.io

Open source

Open-source RAG application framework for building document chat and knowledge-base assistants over private files.

25,524
Open source
Browserless logo
Browserless

Cloud Deploy· browserless.io

Freemium

Cloud and self-hosted headless browser infrastructure for browser automation, scraping, testing, and agent workflows.

13,427
Open source
Promptfoo logo
Promptfoo

Observability· promptfoo.dev

Open source

Open-source testing, red-teaming, and evaluation framework for prompts, RAG, and agents.

22,625
Open source
Maxun logo
Maxun

AI Agents· maxun.dev

Open source

Open-source browser automation and web data extraction platform for building scraping and agent workflows without brittle scripts.

17,431
Open source
LiveKit Agents logo
LiveKit Agents

Voice AI Platforms· livekit.com

Freemium

Open-source framework and cloud platform for building realtime voice, video, and multimodal AI agents with telephony, media pipelines, and production deployment tooling.

14,161
Open source
SWE-agent logo
SWE-agent

AI Agents· swe-agent.com

Open source

Open-source software engineering agent that takes GitHub issues and attempts code changes with a selected language model.

19,697
Open source
Serena logo
Serena

Agent Frameworks· github.com

Open source

MCP toolkit that gives coding agents semantic code retrieval, symbol understanding, and repository editing capabilities.

25,938
Open source
ParadeDB logo
ParadeDB

Vector Databases· paradedb.com

Open source

Postgres-native search and analytics system combining full-text search, vector retrieval, and aggregations without a second search stack.

8,998
Open source
Pipecat logo
Pipecat

Voice AI Platforms· pipecat.ai

Open source

Open-source framework for realtime voice and multimodal AI agents, including transport, orchestration, and production conversation pipelines.

13,114
Open source
Cog logo
Cog

Cloud Deploy· github.com

Open source

Replicate open-source tool for packaging machine learning models as reproducible containers and APIs.

9,436
Open source
Trigger.dev logo
Trigger.dev

Backend & Database· trigger.dev

Freemium

Open-source durable execution platform for long-running jobs, AI workflows, and agent backends with retries, queues, and elastic scaling.

16,268
Open source
CocoIndex logo
CocoIndex

RAG Frameworks· cocoindex.io

Open source

Incremental indexing engine for long-horizon agents and continuously updated RAG dataflows.

10,608
Open source
Unstructured logo
Unstructured

RAG Frameworks· unstructured.io

Freemium

Document processing and ingestion platform for turning PDFs, HTML, Office files, and enterprise content into clean data for RAG pipelines.

15,048
Open source
txtai logo
txtai

RAG Frameworks· neuml.github.io

Open source

All-in-one framework for semantic search, embeddings, LLM orchestration, and language-model workflows.

12,697
Open source
OpenWiki logo
OpenWiki

AI Agents· github.com

Open source

Open-source CLI that generates and maintains agent-ready documentation for software repositories.

10,604
Open source
OpenSEO logo
OpenSEO

Analytics· openseo.so

Open source

Open-source SEO and AI-visibility platform with self-hosting, pay-as-you-go data, MCP access, and reusable agent skills.

8,293
Open source
Grok Build logo
Grok Build

AI Coding Agents· github.com

Open source

SpaceXAI's terminal coding agent with an interactive TUI, headless CI mode, MCP servers, skills, plugins, hooks, and sandboxing.

5,857
Open source
Klavis AI logo
Klavis AI

Agent Frameworks· klavis.ai

Freemium

MCP integration platform and gateway for connecting AI agents to authenticated third-party tools through hosted and open-source MCP servers.

5,763
Open source
OneCLI logo
OneCLI

Auth· onecli.sh

Free

Open-source credential gateway and encrypted vault that injects scoped API credentials into AI-agent requests without exposing raw secrets.

2,672
Open source
ACI.dev logo
ACI.dev

Agent Frameworks· aci.dev

Freemium

Open-source tool-calling and unified MCP platform that connects agents to hundreds of app actions.

4,806
Open source
FalkorDB logo
FalkorDB

Vector Databases· falkordb.com

Open source

FalkorDB is an open-source graph database optimized for fast knowledge graph and GraphRAG workloads, giving AI builders a graph-native retrieval layer for LLM applications.

4,712
Open source
Evidently logo
Evidently

Observability· evidentlyai.com

Freemium

Open-source observability and evaluation framework for monitoring ML and LLM applications with tests and metrics.

7,650
Open source
Giskard logo
Giskard

Observability· giskard.ai

Freemium

Open-source evaluation and testing library for LLM agents, RAG systems, and AI risk checks.

5,476
Open source
moonshotai/Kimi-K3 logo
moonshotai/Kimi-K3

Model Hosting· huggingface.co

Free

moonshotai/Kimi-K3 is currently visible in Hugging Face trending model results for public model and agent research.

7,763
Open source
GitHub Agentic Workflows logo
GitHub Agentic Workflows

AI Agents· github.github.com

Open source

Open-source GitHub automation framework for defining continuous AI workflows in Markdown with scoped tools, permissions, triggers, and agent orchestration.

4,759
Open source
AnySearch logo
AnySearch

RAG Frameworks· anysearch.com

Freemium

Real-time structured search API and agent skill for web, code, academic, and multimodal retrieval.

4,090
Open source
LangWatch logo
LangWatch

Observability· langwatch.ai

Freemium

The complete LLMOps platform for agent testing, evaluations, prompt management, and production observability across AI applications.

3,533
Open source
TruLens logo
TruLens

Observability· trulens.org

Open source

Open-source evaluation and tracking toolkit for measuring LLM app quality, feedback functions, and RAG behavior.

3,400
Open source
DataChain logo
DataChain

RAG Frameworks· datachain.ai

Open source

Versioned context layer for unstructured AI datasets across object storage, built for document and multimodal pipelines.

2,794
Open source
OpenLIT logo
OpenLIT

Observability· openlit.io

Freemium

OpenTelemetry-native AI engineering platform for LLM observability, evaluations, guardrails, and prompt operations.

2,562
Open source
MCPJam Inspector logo
MCPJam Inspector

Observability· mcpjam.com

Freemium

Testing and debugging workbench for MCP servers, MCP apps, and ChatGPT apps.

2,034
Open source
LM Studio logo
LM Studio

LLM Providers· lmstudio.ai

Freemium

LM Studio is a local model runtime and developer platform for discovering, running, and integrating local LLMs, with a TypeScript SDK for builder workflows.

1,716
Open source
Stripe Agent Toolkit logo
Stripe Agent Toolkit

Payments· docs.stripe.com

Open source

Stripe-maintained toolkit and agent integrations for letting AI agents safely interact with Stripe payments APIs.

1,634
Open source
Pixeltable logo
Pixeltable

Backend & Database· pixeltable.github.io

Open source

Multimodal data backend for AI applications, combining versioned tables, model calls, embeddings, media, and incremental computation.

1,592
Open source
Open Connector logo
Open Connector

Auth· oomol.com

Open source

Open-source authentication gateway connecting AI agents to SaaS providers through SDK, CLI, MCP, HTTP, and OpenAPI interfaces.

1,438
Open source
Future AGI logo
Future AGI

Observability· futureagi.com

Freemium

Open-source agent engineering platform that combines evaluations, observability, experiments, and guardrails so teams can ship and improve production AI agents faster.

1,192
Open source
OpenInference logo
OpenInference

Observability· arize-ai.github.io

Open source

OpenTelemetry semantic conventions and instrumentation packages for tracing LLM calls, agent steps, tool use, and retrieval workloads.

1,050
Open source
Microsoft 365 Agents SDK logo
Microsoft 365 Agents SDK

Agent Frameworks· learn.microsoft.com

Open source

Microsoft SDK for building full-stack, multichannel agents for Microsoft 365, Teams, Copilot Studio, Webchat, and enterprise agent workflows.

990
Open source
Arcade logo
Arcade

AI Agents· arcade.dev

Freemium

Tool-calling and MCP platform for production agents, with prebuilt tools and an open MCP server framework.

930
Open source
Roam Code logo
Roam Code

AI Agents· roam-code.com

Open source

Local codebase intelligence CLI and MCP server that builds a SQLite code graph for AI coding agents.

517
Open source
CloudDM logo
CloudDM

Backend & Database· cdmgr.com

Open source

Open-source database development platform with access control, data anonymization, SQL auditing, CI/CD, and standalone or clustered deployment.

312
Open source
Paxm logo
Paxm

RAG Frameworks· github.com

Open source

Persistent provider-neutral memory for Codex, Claude Code, OpenCode, Pi, and MCP coding agents.

147
Open source
Tupper logo
Tupper

Cloud Deploy· github.com

Open source

Open-source local sandboxes for safely running untrusted AI-generated code with isolated execution environments.

147
Open source
Esse logo
Esse

AI Dev Platforms· github.com

Open source

Local image generation and editing workspace for Codex and ChatGPT Work with stdio MCP, local job history, and protected provider keys.

71
Open source
Cactus Hybrid logo
Cactus Hybrid

Model Hosting· github.com

Open source

Open-source hybrid on-device model system that returns calibrated confidence scores so applications can hand uncertain requests to larger cloud models.

60
Open source
OpenRouter MCP Multimodal logo
OpenRouter MCP Multimodal

AI Agents· openrouter.ai

Open source

Open-source MCP server for using OpenRouter models across chat, vision, audio, video analysis, and generation from agent clients.

51
Open source
Jargo logo
Jargo

Voice AI Platforms· github.com

Open source

WebRTC-native, audio-first conversational AI framework for building real-time voice agents in Go.

41
Open source
Arkor logo
Arkor

Fine-tuning Tools· arkor.ai

Freemium

Open-source TypeScript framework and managed GPU workflow for fine-tuning open-weight models and deploying checkpoints as OpenAI-compatible endpoints.

37
Open source
Millwright logo
Millwright

LLM APIs· github.com

Open source

Open-source Rust LLM router for deterministic policy, cache affinity, provider health, and spend control across OpenAI-compatible, Anthropic, and Amazon Bedrock endpoints.

26
Open source
SpotDB logo
SpotDB

Backend & Database· github.com

Open source

Ephemeral data sandbox for AI workflows with guardrails and security, available through MCP.

21
Open source
CLRK logo
CLRK

Cloud Deploy· apoxy.dev

Open source

Open-source Kubernetes agent runtime using gVisor isolation and network guardrails for safer production agent execution.

17
Open source
UI Ticket MCP logo
UI Ticket MCP

AI Testing· uiticket.0ics.ai

Open source

Human-to-agent UI review bridge that turns browser feedback into structured tickets coding agents can retrieve and resolve through MCP.

9
Open source
Aidress logo
Aidress

API Platforms· api.aidress.ai

Open source

Open coordination and trust layer for autonomous agents with capability discovery, verification, matching, transactions, an SDK, API, and MCP server.

6
Open source
Menager logo
Menager

Auth· menager.ai

Open source

Open-source SSO, RBAC, app catalog, and usage analytics for internal applications built with AI coding tools.

6
Open source
ModelFuzz logo
ModelFuzz

AI Testing· modelfuzz.com

Open source

Open-source runtime guardrails and red-team scanner that intercepts unsafe AI-agent tool calls caused by prompt injection.

6
Open source
Coloma logo
Coloma

AI Testing· colomalabs.ai

Open source

Continuous verification and optimization layer for evaluating and tuning self-hosted language models.

3
Open source
Biel.ai logo
Biel.ai

RAG Frameworks· biel.ai

Freemium

Hosted RAG layer and MCP server that gives IDEs and AI assistants source-cited access to indexed product documentation.

3
Open source
CreateOS Sandbox logo
CreateOS Sandbox

Cloud Deploy· createos.sh

Freemium

Firecracker micro-VM sandboxes for AI agents with SDK, CLI, REST API, private networking, snapshots, egress controls, and self-hosting support.

2
Open source
Soma RMCP logo
Soma RMCP

API Platforms· github.com

Open source

Production-oriented Rust RMCP runtime for shipping MCP servers with stdio and HTTP transports, REST, auth, observability, plugins, and generated contracts.

1
Open source
PrintBlocks logo
PrintBlocks

Agent Frameworks· gian-reto.github.io

Open source

Self-hosted HTTP API and optional MCP server that lets agents compose and print structured thermal-printer documents.

Open source
Brain0 logo
Brain0

Auth· github.com

Open source

Local-first provenance and decision graph for AI-written code, linking commits to agent prompts with drift, DLP, memory, and signed attestations.

445
Open source
mcpsnoop logo
mcpsnoop

Observability· github.com

Open source

Transparent MCP proxy and terminal inspector for observing tool calls, payloads, latency, and failures between clients and servers.

267
Open source
Peek CLI logo
Peek CLI

AI Agents· github.com

Open source

Open-source browser bridge that lets coding agents capture live tab screenshots and iterate against rendered frontend output.

53
Open source