# The best free AI agent frameworks for developers Every option in the catalog for when you need to build your own multi-agent system in code — 25 AI agent frameworks for developers, 25 of them free or freemium, with the pricing tier printed on every row. ## Stats - 25 tools listed - 25 free or freemium - 23 with no paid plan at all - 1 sub-categories covered ## FAQ ### What are the best free AI agent frameworks for developers? Flocci AI Tools lists 25 of them, ordered free tiers first: Agno, AWS Strands Agents, CAMEL, Claude Agent SDK and Cloudflare Agents SDK. Every one of them is free or has a free tier. Each entry states what it uniquely does rather than a score. ### Which of these are completely free? 23 on this page are marked fully free with no paid plan at all: Agno, AWS Strands Agents, CAMEL, Claude Agent SDK and Cloudflare Agents SDK. The remaining 2 are freemium, trial or paid, and each is labelled with its exact tier so nothing surprises you at sign-up. ### How is this list ordered? 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. ## Quick picks ### Which AI agent frameworks for developers let you sign in with Google? Cloudflare Agents SDK supports Google sign-in, so you can start without creating a new account. That's 1 of the 25 free AI agent frameworks for developers on this page. ### Which AI agent frameworks for developers can you self-host or run offline? Agno, AWS Strands Agents, CAMEL, Claude Agent SDK and DSPy can be self-hosted or run locally without a browser — useful for privacy, air-gapped networks, or avoiding API rate limits. 22 of the 25 free AI agent frameworks for developers here run offline. ## Tools - [Agno](https://aitools.flocci.in/tool/agno) — Free — Open-source (Apache-2.0) Python framework, 41.7k GitHub stars - [AWS Strands Agents](https://aitools.flocci.in/tool/aws-strands-agents) — Free — Open-source (6,800+ stars) Python and TypeScript SDK from AWS - [CAMEL](https://aitools.flocci.in/tool/camel) — Free — Open-source multi-agent framework focused on scaling agent societies and role-playing - [Claude Agent SDK](https://aitools.flocci.in/tool/claude-agent-sdk) — Free — MIT-licensed Python and TypeScript SDKs exposing the agent loop that powers Claude Code - [Cloudflare Agents SDK](https://aitools.flocci.in/tool/cloudflare-agents-sdk) — Free — Framework for building and deploying stateful AI agents on Cloudflare Workers - [DSPy](https://aitools.flocci.in/tool/dspy) — Free — Open-source (MIT) framework from Stanford NLP, 37k+ GitHub stars - [Firebase Genkit](https://aitools.flocci.in/tool/firebase-genkit) — Free — Open-source framework for AI apps in JavaScript, Go, Dart and Python - [Google Agent Development Kit (ADK)](https://aitools.flocci.in/tool/google-agent-development-kit-adk) — Free — Open-source Python/Java framework from Google for building multi-agent systems - [Haystack](https://aitools.flocci.in/tool/haystack) — Free — Apache-2.0 framework for context-engineered, production RAG and agent pipelines - [LangChain](https://aitools.flocci.in/tool/langchain) — Free — MIT-licensed framework of model, tool and retrieval integrations for agents - [LangChain Deep Agents](https://aitools.flocci.in/tool/langchain-deep-agents) — Free — Batteries-included agent harness with planning, sub-agents and a virtual file system - [LangGraph](https://aitools.flocci.in/tool/langgraph) — Free — Build stateful, multi-agent apps as graphs - [Mastra](https://aitools.flocci.in/tool/mastra) — Free — Open-source TypeScript framework (Apache 2.0) for agents, workflows and RAG - [Microsoft Agent Framework](https://aitools.flocci.in/tool/microsoft-agent-framework) — Free — Unified open-source framework for building and orchestrating multi-agent systems in Python and .NET - [Microsoft AutoGen](https://aitools.flocci.in/tool/microsoft-autogen) — Free — Multi-agent conversation framework - [OpenAI Agents SDK](https://aitools.flocci.in/tool/openai-agents-sdk) — Free — Lightweight agent orchestration from OpenAI - [OpenSandbox (Alibaba)](https://aitools.flocci.in/tool/opensandbox-alibaba) — Free — Secure, fast runtime for executing untrusted AI-generated code - [Pydantic AI](https://aitools.flocci.in/tool/pydantic-ai) — Free — Type-safe Python agent framework from the Pydantic team, validated structured outputs - [Qwen-Agent](https://aitools.flocci.in/tool/qwen-agent) — Free — Agent framework built on Qwen 3+ with function calling, MCP and code interpreter - [Semantic Kernel](https://aitools.flocci.in/tool/semantic-kernel) — Free — MIT SDK for integrating LLMs into C#, Python and Java apps - [smolagents](https://aitools.flocci.in/tool/smolagents) — Free — Extremely minimal open-source library (~1,000 lines) from Hugging Face - [Vercel AI SDK](https://aitools.flocci.in/tool/vercel-ai-sdk) — Free — TypeScript toolkit for streaming text, tool calls and agents across many model providers - [VoltAgent](https://aitools.flocci.in/tool/voltagent) — Free — Open-source TypeScript agent framework with memory, tools and sub-agents - [CrewAI](https://aitools.flocci.in/tool/crewai) — Freemium — Role-based multi-agent 'crews' - [LlamaIndex](https://aitools.flocci.in/tool/llamaindex) — Freemium — Leading framework for RAG and data agents --- Source: Flocci AI Tools — https://aitools.flocci.in/best/best-agent-frameworks-developers Facts last verified: October 2026