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Google Agent Development Kit (ADK) is Google's agent development framework for building complex AI agent systems with tool integration and multimodal processing capabilities.

Letta (formerly MemGPT) is an open-source framework for building stateful AI agents with advanced reasoning and transparent long-term memory. It allows you to visually test, debug, and observe agents.

OpenAI Agents SDK is OpenAI's official agent development toolkit, supporting the building of multi-step workflow AI agents with core features like tool calling and state management.

Agents is an open-source AI agent framework for building intelligent agents that can autonomously plan and execute tasks.