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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
- CrewAI introduction
- Agent Development Kit documentation
- LangGraph overview
- Mastra site
- Mastra guardrails
- Microsoft Agent Framework repository
- OpenAI Agents SDK guide
- OpenAI guardrails and human review
- Pydantic AI overview
- smolagents documentation
- Strands Agents documentation
- AWS prescriptive guidance for Strands Agents
9 listingsFrameworks and runtimes
| Name | Status | Open source | Mechanism |
|---|---|---|---|
| CrewAI | Live | Yes | 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 ADK | Live | Yes | Open source framework for building, debugging, and deploying agents, including graph workflows and multi agent orchestration. orchestration, multi-agent, tools |
| LangGraph | Live | Yes | Low level orchestration runtime for long running stateful agents, with durable execution and human checkpoints inside the graph. orchestration, approvals, state |
| Mastra | Live | Yes | 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 Framework | Live | Yes | 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 SDK | Live | Yes | 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 AI | Live | Yes | Typed Python agent SDK with structured outputs, guardrails, and companion packages for graph control flow and spending limits. python, orchestration, guardrails |
| smolagents | Live | Yes | 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 Agents | Live | Yes | 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.