Key features

• Open-source platform for building, deploying, and managing AI agents.
• Persistent memory lets agents retain context across conversations.
• Python framework for creating and customizing agents.
• Self-hostable server for full control over deployment.
• Licensed under Apache-2.0.

Platforms: Windows, macOS, Linux.

Links

• Official website: https://www.letta.com
• Source code: https://github.com/letta-ai/letta

Pricing

Freemium. A free, open-source self-hosted version is available under Apache-2.0, and Letta Cloud also offers a free tier.