Guide, updated Oct 16, 2026
Best open-source infrastructure for AI agents
Every tool here is marked open source in our data, across all layers of the agent stack. We list 18 open-source agent infrastructure. Summaries come from each vendor's own site and every link was checked on or before Oct 16, 2026.
Shortlist
All 18 at a glance
Alphabetical. Nothing in this guide is a paid placement.
| Tool | What it does | Category | More |
|---|---|---|---|
| AIO Sandbox | All-in-one agent sandbox with browser, shell, file access, VSCode Server, and MCP in one container. | Code Sandboxes | Alternatives |
| Browser Use | Open-source browser agent library plus hosted remote browsers for AI agents. | Browsers & Computer Use | Alternatives |
| Cognee | Open-source agent memory platform built on graph and vector stores. | Memory & Context | Alternatives |
| CrewAI | Framework and platform for multi-agent teams. | Agent Frameworks | Alternatives |
| Daytona | Secure sandboxes for running AI-generated code. | Code Sandboxes | Alternatives |
| E2B | Isolated cloud machines for agents to run code, browse, and use tools. | Code Sandboxes | Alternatives |
| Firecrawl | Turns websites into clean, LLM-ready data with crawl, scrape, and search APIs. | Search & Web Data | Alternatives |
| Helicone | AI gateway with routing and LLM observability. | Observability & Evals | Alternatives |
| Langfuse | Open-source tracing, evals, and observability for agents. | Observability & Evals | Alternatives |
| LangGraph | Agent orchestration framework with durable execution and human-in-the-loop. | Agent Frameworks | Alternatives |
| Letta | Platform for stateful agents that keep long-term memory. | Memory & Context | Alternatives |
| Mastra | TypeScript framework for agents with memory, tools, MCP, and workflows. | Agent Frameworks | Alternatives |
| Mem0 | Memory layer that lets agents learn from past interactions. | Memory & Context | Alternatives |
| OpenAI Agents SDK | OpenAI's lightweight Python framework for multi-agent workflows. | Agent Frameworks | Alternatives |
| Pydantic AI | Type-safe Python agent framework from the Pydantic team. | Agent Frameworks | Alternatives |
| Stagehand | SDK for browser agents with a Playwright-style API and self-healing selectors. | Browsers & Computer Use | Alternatives |
| Steel | Open-source browser API for running fleets of cloud browsers for agents. | Browsers & Computer Use | Alternatives |
| Vercel AI SDK | Unified TypeScript SDK for AI apps and agents across model providers. | Agent Frameworks | Alternatives |
How to choose
What to check before you pick
- License: read it. Some projects are open source with a hosted paid tier.
- Activity: recent releases and issue responses on the repository.
- Self-hosting effort: what you need to run and maintain it yourself.
- Hosted option: whether the maintainers offer a managed version if you outgrow self-hosting.
- Fit: start from the layer of the stack you need, then compare within it.
This checklist is general advice. Check each vendor's docs and pricing page for current details.
The tools
Each option in one paragraph
AIO Sandbox
sandbox.agent-infra.comAll-in-one agent sandbox with browser, shell, file access, VSCode Server, and MCP in one container.
In their words: “AIO Sandbox”
Browser Use
browser-use.comOpen-source browser agent library plus hosted remote browsers for AI agents.
In their words: “Browser Use Agents & Browser Infrastructure | Browser Use”
Cognee
cognee.aiOpen-source agent memory platform built on graph and vector stores.
In their words: “Cognee - Open-Source Agent Memory Platform”
CrewAI
crewai.comFramework and platform for multi-agent teams.
In their words: “CrewAI”
Daytona
daytona.ioSecure sandboxes for running AI-generated code.
In their words: “Daytona - Secure Infrastructure for Running AI-Generated Code”
E2B
e2b.devIsolated cloud machines for agents to run code, browse, and use tools.
In their words: “E2B | The Enterprise AI Agent Cloud”
Firecrawl
firecrawl.devTurns websites into clean, LLM-ready data with crawl, scrape, and search APIs.
In their words: “Firecrawl | Web Data API for AI Agents”
Helicone
helicone.aiAI gateway with routing and LLM observability.
In their words: “Helicone / AI Gateway & LLM Observability”
Langfuse
langfuse.comOpen-source tracing, evals, and observability for agents.
In their words: “Langfuse: Open Source Agent Evals & Observability”
LangGraph
langchain.comAgent orchestration framework with durable execution and human-in-the-loop.
In their words: “LangGraph: Agent Orchestration Framework for Reliable AI Agents”
Letta
letta.comPlatform for stateful agents that keep long-term memory.
In their words: “Letta | Machines that learn”
Mastra
mastra.aiTypeScript framework for agents with memory, tools, MCP, and workflows.
In their words: “TypeScript AI Framework for Agents and Apps | Mastra”
Mem0
mem0.aiMemory layer that lets agents learn from past interactions.
In their words: “Mem0 - AI Memory Layer for your Agents & Apps | Persistent Context”
OpenAI Agents SDK
openai.github.ioOpenAI's lightweight Python framework for multi-agent workflows.
In their words: “OpenAI Agents SDK”
Pydantic AI
pydantic.devType-safe Python agent framework from the Pydantic team.
In their words: “Pydantic AI | Pydantic Docs”
Stagehand
stagehand.devSDK for browser agents with a Playwright-style API and self-healing selectors.
In their words: “The SDK for browser agents | Stagehand”
Steel
steel.devOpen-source browser API for running fleets of cloud browsers for agents.
In their words: “Steel | Open-source Browser Infrastructure for AI Agents”
Vercel AI SDK
ai-sdk.devUnified TypeScript SDK for AI apps and agents across model providers.
In their words: “AI SDK”
FAQ
Questions
Which open-source agent infrastructure does Agent Stack Directory list?
18: AIO Sandbox, Browser Use, Cognee, CrewAI, Daytona, E2B, Firecrawl, Helicone, Langfuse, LangGraph, Letta, Mastra, Mem0, OpenAI Agents SDK, Pydantic AI, Stagehand, Steel, Vercel AI SDK.
Which of them are open source?
AIO Sandbox, Browser Use, Cognee, CrewAI, Daytona, E2B, Firecrawl, Helicone, Langfuse, LangGraph, Letta, Mastra, Mem0, OpenAI Agents SDK, Pydantic AI, Stagehand, Steel, Vercel AI SDK are marked open source in our data.
How is this list ordered?
Alphabetically. No placement in this guide is paid. Sponsored and featured tools are labeled elsewhere on the site and never reordered here.
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