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Open source agent frameworks

Open source agent frameworks lists 9 Frameworks and runtimes entries in alphabetical order. Frameworks and runtimes marked open source, listed alphabetically by name. Nothing on the page is scored. The names are CrewAI, Google ADK, LangGraph, Mastra, Microsoft Agent Framework, OpenAI Agents SDK, Pydantic AI, smolagents, Strands Agents.

Last verified 2026-10-16

Sources

9 listingsFrameworks and runtimes

Listings in alphabetical order
NameStatusOpen sourceMechanism
CrewAILiveYes

Open source framework that pairs event driven Flows for control flow with Crews of role based agents that collaborate on a delegated task.

multi-agent, orchestration, python

Google ADKLiveYes

Open source framework for building, debugging, and deploying agents, including graph workflows and multi agent orchestration.

orchestration, multi-agent, tools

LangGraphLiveYes

Low level orchestration runtime for long running stateful agents, with durable execution and human checkpoints inside the graph.

orchestration, approvals, state

MastraLiveYes

Open source TypeScript framework for agents and workflows, with memory, tool approvals, and processors that can block or redact content.

typescript, orchestration, approvals

Microsoft Agent FrameworkLiveYes

Open framework for building and orchestrating agents and multi agent workflows in Python and .NET, with graph workflows and human checkpoints.

multi-agent, orchestration, approvals

OpenAI Agents SDKLiveYes

Library that runs an agent loop in your application, with tools, handoffs, guardrails, sessions, and human approval before a tool runs.

orchestration, tools, approvals

Pydantic AILiveYes

Typed Python agent SDK with structured outputs, guardrails, and companion packages for graph control flow and spending limits.

python, orchestration, guardrails

smolagentsLiveYes

Open source Python library whose code agents write actions as code, with an option to run that code in a sandbox.

python, tools, code-agents

Strands AgentsLiveYes

Open source SDK that runs a model driven agent loop, with hooks, execution limits, and guardrails around each step.

orchestration, guardrails, tools

Questions

How many listings match Open source agent frameworks?
9 listings match. The list is alphabetical.
Which listings are on Open source agent frameworks?
CrewAI, Google ADK, LangGraph, Mastra, Microsoft Agent Framework, OpenAI Agents SDK, Pydantic AI, smolagents, Strands Agents.

Comparisons

Pairs in this filter where both listings have source URLs.