// category · 17 tools · 17 open source
Agent Frameworks
Libraries for composing models, tools, memory and control flow into agents. Pick on language, abstraction level, observability and how much control you need over the loop.
Agnoagno.comPython framework and runtime for multi-agent systems with memory, knowledge and tools.Agent FrameworksOpen source★ 42.6k
Lettaletta.comPlatform for stateful agents with long-term memory, evolved from the MemGPT research project.Agent FrameworksOpen source★ 25k
LlamaIndexllamaindex.aiFramework for building agents over your data, strong on ingestion, indexing, retrieval and document workflows.Agent FrameworksOpen source★ 52.4k
DSPydspy.aiFramework for programming rather than prompting LLMs, with optimisers that tune prompts and weights automatically.Agent FrameworksOpen source★ 38.5k
Mastramastra.aiTypeScript framework for agents, workflows, RAG and evals, built by the team behind Gatsby.Agent FrameworksOpen source★ 28.6k
Haystackhaystack.deepset.aiOpen-source orchestration framework from deepset for production-grade RAG pipelines and agents.Agent FrameworksOpen source★ 26.7k
Agent Development Kitadk.devGoogle's open-source framework for developing, evaluating and deploying multi-agent systems.Agent FrameworksOpen source★ 21.7k
LangChainlangchain.comWidely used framework for building LLM applications and agents, with hundreds of model, tool and data integrations.Agent FrameworksOpen source★ 147.5k
CrewAIcrewai.comPython framework for orchestrating role-playing teams of agents that collaborate on tasks, plus an enterprise platform.Agent FrameworksOpen source★ 59.4kLangGraphlangchain.comLow-level orchestration library for stateful, long-running agents modelled as graphs, with persistence and human-in-the-loop.Agent FrameworksOpen source★ 42.7k
OpenAI Agents SDKopenai.github.ioLightweight framework for multi-agent workflows with handoffs, guardrails and built-in tracing.Agent FrameworksOpen source★ 29.8k
smolagentshuggingface.coHugging Face's minimal library for agents that think in code, working with any model.Agent FrameworksOpen source★ 29.7k
Semantic Kernellearn.microsoft.comMicrosoft's model-agnostic SDK for integrating LLMs and agents into C#, Python and Java applications.Agent FrameworksOpen source★ 28.6k
Vercel AI SDKai-sdk.devTypeScript toolkit for building AI apps and agents with streaming UI, tool calling and a unified provider API.Agent FrameworksOpen source★ 27.1k
Pydantic AIpydantic.devAgent framework from the Pydantic team that brings type safety and structured outputs to LLM apps.Agent FrameworksOpen source★ 20.4k
AutoGenmicrosoft.github.ioMicrosoft Research framework for building multi-agent systems where agents converse to solve tasks.Agent FrameworksOpen source★ 61.3k
VoltAgentvoltagent.devOpen-source TypeScript agent framework with memory, workflows, tools and MCP support, paired with the optional VoltOps console for tracing and deployment.Agent FrameworksOpen source★ 10.7k