Agent Frameworks (Developers)free

Google Agent Development Kit (ADK)

Open-source Python/Java framework from Google for building multi-agent systems

Visit Google Agent Development Kit (ADK)

What Google Agent Development Kit (ADK) does

  • 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

Google Agent Development Kit (ADK) — straight answers

What is Google Agent Development Kit (ADK)?

Google Agent Development Kit (ADK) is listed under Agent Frameworks (Developers), in the AI Agents & Automation category on Flocci AI Tools. Open-source Python/Java framework from Google for building multi-agent systems. It is free, with no paid plan attached, and it lives at adk.dev.

Is Google Agent Development Kit (ADK) free?

Google Agent Development Kit (ADK) is listed as fully free — there is no paid tier attached to it in the catalog. That makes it one of the 115 entries on Flocci AI Tools with no upgrade path built in.

What can Google Agent Development Kit (ADK) do?

Google Agent Development Kit (ADK) does 3 things the catalog singles out: 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.

What is the best free alternative to Google Agent Development Kit (ADK)?

Agno is the closest free alternative: it sits in the same Agent Frameworks (Developers) sub-category and is free. AWS Strands Agents, DSPy and LangGraph also start free. The full list is on the alternatives page.

See the full list →

Google Agent Development Kit (ADK) alternatives

Compare all alternatives →

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

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

Head-to-head comparisons

Google Agent Development Kit (ADK) vs LangGraphGoogle Agent Development Kit (ADK) vs CrewAIGoogle Agent Development Kit (ADK) vs OpenAI Agents SDKGoogle Agent Development Kit (ADK) vs Microsoft AutoGenGoogle Agent Development Kit (ADK) vs LlamaIndexGoogle Agent Development Kit (ADK) vs Pydantic AI