Every option in the catalog for when you need to build your own multi-agent system in code — 12 AI agent frameworks for developers, 12 of them free or freemium, with the pricing tier printed on every row.
Flocci AI Tools lists 12 of them, ordered free tiers first: Agno, AWS Strands Agents, DSPy, Google Agent Development Kit (ADK) and LangGraph. Every one of them is free or has a free tier. Each entry states what it uniquely does rather than a score.
10 on this page are marked fully free with no paid plan at all: Agno, AWS Strands Agents, DSPy, Google Agent Development Kit (ADK) and LangGraph. The remaining 2 are freemium, trial or paid, and each is labelled with its exact tier so nothing surprises you at sign-up.
Free tools first, then freemium, then trial, then paid, and alphabetically inside each tier. Nobody pays to appear higher: Flocci AI Tools carries no ads, no sponsored slots and no paid listings, so the order reflects price and nothing else.
| Tool | Pricing | Type | Listed for |
|---|---|---|---|
| Agno | Free | Agent Frameworks (Developers) | Open-source (Apache-2.0) Python framework, 41.7k GitHub stars |
| AWS Strands Agents | Free | Agent Frameworks (Developers) | Open-source (6,800+ stars) Python and TypeScript SDK from AWS |
| DSPy | Free | Agent Frameworks (Developers) | Open-source (MIT) framework from Stanford NLP, 37k+ GitHub stars |
| Google Agent Development Kit (ADK) | Free | Agent Frameworks (Developers) | Open-source Python/Java framework from Google for building multi-agent systems |
| LangGraph | Free | Agent Frameworks (Developers) | Build stateful, multi-agent apps as graphs |
| Mastra | Free | Agent Frameworks (Developers) | Open-source TypeScript framework (Apache 2.0) for agents, workflows and RAG |
| Microsoft AutoGen | Free | Agent Frameworks (Developers) | Multi-agent conversation framework |
| OpenAI Agents SDK | Free | Agent Frameworks (Developers) | Lightweight agent orchestration from OpenAI |
| Pydantic AI | Free | Agent Frameworks (Developers) | Type-safe Python agent framework from the Pydantic team, validated structured outputs |
| smolagents | Free | Agent Frameworks (Developers) | Extremely minimal open-source library (~1,000 lines) from Hugging Face |
| CrewAI | Freemium | Agent Frameworks (Developers) | Role-based multi-agent 'crews' |
| LlamaIndex | Freemium | Agent Frameworks (Developers) | Leading framework for RAG and data agents |