Agent platforms
Autonomous LLM workflows
Frameworks and runtimes for building multi-step, tool-using agents — from research toys to production orchestration.
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#01
LangChain
· LangChain Recommended FeaturedThe dominant LLM application framework. LangGraph for agent orchestration, LangSmith for observability and evals, LangServe for deployment.
AIMenta — The de facto standard for production LLM apps. LangSmith alone justifies the ecosystem investment for teams shipping AI features.
Open source · Free OSS; LangSmith US$39/user/mo · API · Free tier · Self-host · Since 2022 -
#02
n8n
· n8n Recommended FeaturedOpen-source workflow automation with first-class LLM and agent nodes. Self-hostable, code-friendly, and genuinely powerful for engineer-led automation.
AIMenta — The default choice for teams with engineers — much more flexible than Zapier per dollar. Self-hosted is genuinely viable.
Open source · Free self-hosted; Cloud Starter US$24/mo · API · Free tier · Self-host · Since 2019 -
#03
LlamaIndex
· LlamaIndex RecommendedRAG-first LLM framework. LlamaParse for document parsing is genuinely class-leading; LlamaCloud handles managed RAG infrastructure.
AIMenta — Pick this if document parsing and RAG quality dominate your use case. LangChain for broader agent work.
Open source · Free OSS; LlamaCloud usage-based · API · Free tier · Self-host · Since 2022 -
#04
AutoGen
· Microsoft Decent fitMicrosoft Research's multi-agent framework. Strong on conversational agent patterns and group chat orchestration.
AIMenta — Useful for exploring agent patterns. For production, LangChain or CrewAI are more battle-tested.
Open source · Free OSS · API · Self-host · Since 2023 -
#05
CrewAI
· CrewAI Decent fitMulti-agent framework with role-based agent definitions. Easier to reason about than LangGraph for simple multi-agent setups.
AIMenta — Worth evaluating for multi-agent setups. For production-critical work, LangGraph remains more battle-tested.
Open source · Free OSS; Enterprise pricing on request · API · Self-host · Since 2024 -
#06
OpenAI Assistants API
· OpenAI Decent fitOpenAI's managed agent API with built-in code interpreter, file search (RAG), and function calling. Lower-code path than DIY frameworks.
AIMenta — Lower-friction option if you're all-in on OpenAI. For multi-model or complex agent topologies, LangChain.
Usage-based · Token + tool use pricing · API · Since 2023