#1

LlamaIndex

★★★★ 4.4 Free / $50+ Free plan

Open-source data orchestration framework connecting LLMs with external data sources for building RAG pipelines, document Q&A, and AI agents.

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✓ Best-in-class RAG components✓ Largest connector ecosystem (200+ via LlamaHub)✓ Production-ready prepackaged agents
#2

Flowise

★★★★ 4.2 Free / $19+ Free plan

Open-source low-code platform for building AI agents, chatbots, and LLM-powered workflows through a visual drag-and-drop interface.

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✓ Visual drag-and-drop for rapid prototyping✓ Flexible model choice across LLM providers✓ Self-hosting for full data control

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