Agent frameworks AI tools

Libraries and platforms for building autonomous AI agents and pipelines

Tools: 15
Free options: 15
With API: 12
Open source: 13

15 of 15

Agno

Free

Agent frameworks

Open-source agent framework and high-performance runtime for building multi-agent systems at scale

Free tier available · AgentOS for production deployment

LangGraphLangChainClaudeSlack+1

Free tierDevAPIOSSSelf-host

Multi-provider (30+ model providers)Growing

AutoGen

Free

Agent frameworks

Build multi-agent AI applications with conversable, customizable agents powered by LLMs

FreeDevAPIOSSSelf-host

OpenAI, Azure OpenAI, and others

CAMEL-AI

Free

Agent frameworks

Finding the Scaling Laws of Agents

HuggingFaceArxivGmailGoogle Calendar+40

Free tierEveryoneOSSSelf-host

18k

Composio

Free

Agent frameworks

Give your AI secure access to 1,500+ apps in minutes

Free tier includes 100,000 actions per month. Enterprise tier available with SSO, governance, and audit controls.

GmailSlackNotionGoogle Calendar+44

Free tierEveryoneAPI

CrewAI

Free

Agent frameworks

The open platform that accelerates enterprise agent adoption at scale

Freemium model with enterprise pricing available

ArizeGalileoDataDogPatronus

Free tierEveryoneAPIOSSSelf-host

Multi-LLM (model-agnostic)10M+ users

Dify

Free

Agent frameworks

Build, deploy, and manage autonomous AI agents and RAG pipelines — effortlessly at any scale.

LLMsRAGMCP

Free tierEveryoneAPIOSSSelf-host

Multi-model (OpenAI, Anthropic, open-source, and more)Popular

DSPy

Free

Agent frameworks

The framework for programming—not prompting—language models

Open-source library distributed under the MIT license; free to install via pip.

FreeEveryoneOSSSelf-host

39k

Flowise

Free

Agent frameworks

Open source visual platform for building AI agents and LLM-powered applications

Free · $35/mo Starter · $65/mo Pro

LangChainSlackNotionOpenTelemetry+1

Free tierEveryoneAPIOSSSelf-host

Agnostic (100+ LLMs supported)12kPopular

Haystack

Free

Agent frameworks

The open-source AI framework for production-ready agents, RAG & context engineering

Open source · Enterprise support available

OpenAIAnthropicMistralHugging Face+3

Free tierDevAPIOSSSelf-host

Agnostic (OpenAI, Anthropic, Mistral, Hugging Face, and more)Popular

Langflow

Free

Agent frameworks

Low-code AI builder for agentic and RAG applications

Free cloud account available; enterprise-grade cloud platform also offered. Self-hosting (OSS) is also an option.

AirbyteAnthropicAzureBing+40

Free tierEveryoneAPIOSSSelf-host

Multi-provider (supports all major LLMs including Anthropic, OpenAI, Meta, Mistral, NVIDIA, Ollama, Groq, HuggingFace, Amazon Bedrock, Perplexity, and more)156k

Letta

Free

Agent frameworks

An AI research lab building self-improving agents that remember everything and learn continuously.

GitHubDiscord

Free tierEveryoneAPIOSSSelf-host

Niche

Mastra

Free

Agent frameworks

Build AI agents. Build, observe, and improve agents that run for days with Mastra, the leading TypeScript agent framework.

Starter: $0/mo (100K observability events, 24 CPU hrs, 15-day retention); Teams: $250/mo (1M events, 250 CPU hrs, 6-month retention, SSO, SOC 2); Enterprise: custom pricing. Self-hosted Apache 2.0 open-source option also available.

ReactNext.jsNode.jsLibSQL+8

Free tierEveryoneOSSSelf-host

Multi-provider (OpenAI, Anthropic, Google, xAI, and others via Mastra model router)

OpenHands

Free

Agent frameworks

The Open Platform for Cloud Coding Agents

Free open-source local tier; Free SaaS Individual tier (BYOK or pay-as-you-go at-cost models); Enterprise at custom pricing (SaaS or self-hosted in VPC).

GitHubGitLabBitbucketSlack+6

Free tierEveryoneAPIOSSSelf-host

Model-agnostic (supports Claude Code, Codex, Gemini CLI, and others; BYOK supported)81k