Semantic Kernel

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

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

LangChain is a framework for building applications powered by language models. It provides core capabilities such as chaining, memory management, and agent orchestration, making it a go-to choice for AI agent development.

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.