Alternatives to Sublayer

CrewAI is an enterprise multi-agent platform: visual builder plus a governed control plane for production agent workflows.

OpenAI Agents SDK: a free MIT-licensed Python framework for building multi-agent workflows with handoffs, guardrails, sandbox agents, and

Microsoft's open-source, code-first Python framework for building stateful, data-intensive conversational AI agents.

AutoGen is Microsoft's open-source framework for building conversational and event-driven multi-agent AI apps in Python and .NET.

Microsoft's open-source SDK for building AI agents and copilots with plugins, memory, and multi-agent orchestration.

Microsoft Agent Framework is an open-source SDK for building agentic AI with workflows, checkpoints, and the GA Agent Harness runtime.

Open-source Python framework for building multi-agent AI teams that deliver results straight to Telegram, Slack, Discord and WhatsApp.

Free 16-chapter Datawhale open-source tutorial that teaches you to build AI agents from scratch in Python, including your own HelloAgents framework.

Open source durable execution SDK for background jobs, workflows, and AI agents — wrap code in step.run() and get retries, flow control,

Open-source TypeScript agent framework with durable workflows, memory, and observability built into one stack.

Haystack is deepset's open-source Python framework for building inspectable RAG pipelines and production-grade AI agents

Open-source TypeScript platform for durable AI agents and long-running background jobs that survive redeploys and crashes.

Pydantic AI is the typed, open-source Python agent framework that returns Pydantic-validated objects from every run.

Build production AI agents with open source Python and TypeScript harness SDKs you fully control

Open-source meta-harness that runs Claude Code, Codex, Pi and your own agents under one policy, sandbox and cost layer

TabTin is an open-source team harness where AI sub-agents and people share one task surface for code, docs, spreadsheets and research.

Open-source multi-agent framework that assigns PM, architect, engineer and QA roles to GPTs for structured software tasks

AgentScope is an open-source Python framework from Alibaba for building distributed multi-agent AI systems.

Open Harness is an MIT-licensed TypeScript SDK for building Claude Code-style agents with stateless primitives and composable middleware.

LangChain's open agent frameworks plus LangSmith — tracing, evals, deployment, sandboxes and an LLM gateway for agents in production.

Hugging Face's Apache-2.0 Python library for AI agents that write and run their actions as code.

Hermes Agent: a self-hosted open-source AI agent with persistent memory that builds reusable skills across 20+ chat platforms.

Python agent framework for small language models — local engines, OpenAI-compatible servers, or hosted providers, with tool-call tracing

Xagent is an open-source autonomous AI agent engine that plans tasks from stated outcomes instead of workflows.

CowAgent is an open-source AI agent harness that plans tasks, runs tools, and grows long-term memory across sessions.

Open-source library of 817 structured cybersecurity skill files your AI coding agent loads on demand, mapped to MITRE ATT&CK and licensed Apache 2.0.

Eino is an open-source Go LLM framework from ByteDance for building agents, graphs, and RAG pipelines in your existing Go backend.

Hermes Desktop is a free, open-source desktop GUI for the Hermes Agent — a self-hosted AI agent with a built-in learning loop that turns

DeerFlow is an open-source SuperAgent harness that runs deep research, coding, and creation tasks in a persistent Docker sandbox.

Learn Claude Code is an open-source tutorial that builds a Claude Code-style agent harness in Bash across 20 runnable sessions.