AI Agents & Automation (12)

All 12 AI agent frameworks for developers in the Flocci catalog, 12 of them free or freemium. Pricing tier and real capabilities on every entry — no ads, no sponsored placement.

AllGeneral Autonomous AgentsWorkflow AutomationAgent Frameworks (Developers)Real-Time Voice AgentsBrowser & Computer-Use AgentsMCP EcosystemAgent Memory & RAG-as-a-Service

LangGraph

Agent Frameworks (Developers)
free
  • Build stateful, multi-agent apps as graphs
  • Human-in-the-loop and durable execution
  • Works with any LLM
  • Open-source with a hosted platform
Visit

CrewAI

Agent Frameworks (Developers)
freemium
  • Role-based multi-agent 'crews'
  • Simple Python API for collaboration
  • Tasks, tools and flows
  • Open-source core
Visit

OpenAI Agents SDK

Agent Frameworks (Developers)
free
  • Lightweight agent orchestration from OpenAI
  • Agent handoffs, guardrails and tracing
  • Tool and function calling built in
  • Open-source, pay only for model usage
Visit

Microsoft AutoGen

Agent Frameworks (Developers)
free
  • Multi-agent conversation framework
  • Event-driven, async agent design
  • Studio UI for prototyping
  • Fully open-source
Visit

LlamaIndex

Agent Frameworks (Developers)
freemium
  • Leading framework for RAG and data agents
  • Connect LLMs to your documents & APIs
  • Agentic document workflows
  • Open-source with a hosted cloud
Visit

Google Agent Development Kit (ADK)

Agent Frameworks (Developers)
free
  • Open-source Python/Java framework from Google for building multi-agent systems
  • Native integration with Vertex AI Agent Engine and Gemini models
  • Model-agnostic — works with non-Google LLMs via LiteLLM
Visit

Pydantic AI

Agent Frameworks (Developers)
free
  • Type-safe Python agent framework from the Pydantic team, validated structured outputs
  • Model-agnostic (OpenAI, Anthropic, Gemini, Groq, Mistral, local)
  • Built-in dependency injection and streaming; pairs with Pydantic Logfire for observability
Visit

Mastra

Agent Frameworks (Developers)
free
  • Open-source TypeScript framework (Apache 2.0) for agents, workflows and RAG
  • Drops directly into existing React/Next.js apps or runs standalone
  • Built-in workflow engine with suspend/resume and human-in-the-loop steps
Visit

Agno

Agent Frameworks (Developers)
free
  • Open-source (Apache-2.0) Python framework, 41.7k GitHub stars
  • AgentOS: FastAPI-based production runtime for deploying agents
  • Control-plane UI for monitoring live agent systems across clouds
Visit

smolagents

Agent Frameworks (Developers)
free
  • Extremely minimal open-source library (~1,000 lines) from Hugging Face
  • CodeAgent paradigm: agents write actions as executable code, not JSON
  • Model-agnostic and modality-agnostic (text, vision, audio) with sandboxed execution via E2B/Docker/Modal
Visit

AWS Strands Agents

Agent Frameworks (Developers)
free
  • Open-source (6,800+ stars) Python and TypeScript SDK from AWS
  • Steering handlers/hooks that catch agent mistakes before execution
  • Native Bedrock and AWS AgentCore integration, plus any-LLM support
Visit

DSPy

Agent Frameworks (Developers)
free
  • Open-source (MIT) framework from Stanford NLP, 37k+ GitHub stars
  • Compiles/optimizes prompts automatically against metrics instead of manual prompt tuning
  • Production use at Databricks, Shopify, Dropbox, AWS; Shopify reports ~550x cost reduction
Visit

Agent Frameworks (Developers) — straight answers

What are the best free AI agent frameworks for developers?

Flocci AI Tools lists 12 AI agent frameworks for developers, ordered free tiers first: Agno, AWS Strands Agents, DSPy, Google Agent Development Kit (ADK) and LangGraph. All of them are free or have a free tier. Every entry states what it uniquely does, not a score.

Are there completely free AI agent frameworks for developers?

Yes — 10 of these are marked fully free with no paid plan attached: Agno, AWS Strands Agents, DSPy, Google Agent Development Kit (ADK) and LangGraph. The rest are freemium, trial or paid, and each row states which.

What should I look for in AI agent frameworks for developers?

Start with what you need to do: build your own multi-agent system in code. Then check the pricing tier, because "free" here means no paid plan at all while "freemium" means a free tier under paid plans. Every tool on this page lists both.

See the full list →

Looking for a ranked shortlist instead? See the best free AI agent frameworks for developers.