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smolagents is a lightweight agent framework from Hugging Face for quickly building tool-using LLM agents.

GPT Engineer is an AI tool that generates entire codebases based on natural language descriptions. Just describe what you want to build, the AI asks for clarification, and then builds it.

Graphiti is a temporal knowledge-graph engine for agent memory, helping systems continuously accumulate long-term context.

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.