The best letta alternatives

harness-sdk

strands-agents/harness-sdk

Build an agent harness and control it end-to-end. Open-source SDK for production AI agents in Python & TypeScript - any model, any cloud.

Choose harness-sdk if…

• you would rather work in Python
• you prefer a smaller, narrower project to a large one
• you specifically need agent-framework or agentic

Shares ai, ai-agents, llm, llm-agent with letta.

hermes-agent

NousResearch/hermes-agent

The agent that grows with you

Choose hermes-agent if…

• you would rather work in Python
• MIT License suits your use better than Apache License 2.0
• you want the more widely starred option (263.0k)
• you specifically need ai-agent or anthropic

Shares ai, ai-agents, llm with letta.

langchain

langchain-ai/langchain

The agent engineering platform.

Choose langchain if…

• you would rather work in Python
• MIT License suits your use better than Apache License 2.0
• you want the more widely starred option (149.4k)
• you specifically need agents or anthropic

Shares ai, ai-agents, llm with letta.

mem0

mem0ai/mem0

The Memory Layer for AI Agents - Drop-in memory infrastructure for AI agents and apps. Context that persists. Built for production.

Choose mem0 if…

• you would rather work in Python
• you want the more widely starred option (68.9k)
• you specifically need agentic-memory or agentic-memory-system

Shares ai, ai-agents, llm with letta.

CowAgent

zhayujie/CowAgent

Open-source super AI assistant & Agent Harness. Plans tasks, runs tools and skills, self-evolves with memory and knowledge. Multi-agent, multi-model, multi-channel. Lightweight, extensible, one-line install. (formerly chatgpt-on-wechat)

Choose CowAgent if…

• you would rather work in Python
• MIT License suits your use better than Apache License 2.0
• you want something your agent can install directly rather than a library to wire up yourself
• you want the more widely starred option (47.9k)

Shares ai, ai-agents, llm with letta.

langgraph

langchain-ai/langgraph

Build resilient agents.

Choose langgraph if…

• you would rather work in Python
• MIT License suits your use better than Apache License 2.0
• you want the more widely starred option (44.9k)
• you specifically need agents or chatgpt

Shares ai, ai-agents, llm with letta.

GenAI_Agents

NirDiamant/GenAI_Agents

50+ tutorials and implementations for Generative AI Agent techniques, from basic conversational bots to complex multi-agent systems.

Choose GenAI_Agents if…

• you would rather work in Jupyter Notebook
• you specifically need agentic-ai or agents

Shares ai, ai-agents, llm with letta.

CompanyOS

kortix-ai/CompanyOS

Kortix CompanyOS – the open-source operating system for your company. Multiplayer AI agents, your company as code, sovereign on your infrastructure or ours.

Choose CompanyOS if…

• you would rather work in TypeScript
• you specifically need company-as-code or company-operating-system

Shares ai, ai-agents, llm with letta.

E2B

e2b-dev/E2B

Open-source, secure environment with real-world tools for enterprise-grade agents.

Choose E2B if…

• you would rather work in Python
• you specifically need agent or ai-agent

Shares ai, ai-agents, llm with letta.

opensquilla

TokenRhythm/opensquilla

OpenSquilla — Token-Efficient AI Agent with same budget, higher intelligence density

Choose opensquilla if…

• you would rather work in Python
• you want something your agent can install directly rather than a library to wire up yourself
• you prefer a smaller, narrower project to a large one
• you specifically need agent or deep-learning

Shares ai, ai-agents, llm with letta.

Raven

EverMind-AI/Raven

The Harness of Harnesses • Super Agent: a trusted, persistent, self-evolving multi-agent ecosystem for all-domain collaboration.

Choose Raven if…

• you would rather work in Python
• you prefer a smaller, narrower project to a large one
• you specifically need anthropic or chatgpt

Shares ai, ai-agents, llm with letta.

firecrawl

firecrawl/firecrawl

The context API to search, scrape, and interact with the web at scale. 🔥

Choose firecrawl if…

• you would rather work in TypeScript
• GNU Affero General Public License v3.0 suits your use better than Apache License 2.0
• you want the more widely starred option (201.3k)
• you specifically need ai-crawler or ai-scraping

Shares ai, ai-agents, llm with letta.