10 Open-Source No-Code Platforms for Building LLM Apps, RAG Systems, and AI Agents

A curated roundup highlights 10 open-source, no-code platforms that developers and teams can use to build LLM-powered applications, RAG pipelines, and autonomous agents without writing boilerplate orchestration code. The platforms span visual workflow builders, drag-and-drop agent designers, and low-code RAG constructors — addressing the growing demand for faster prototyping and non-engineer access to AI tooling. For developers, the practical value here is discovering vetted options for internal tooling, demo scaffolding, or handing off AI workflow construction to less technical teammates. The open-source constraint in the selection criteria is important: it means teams can self-host, audit, and customize these tools rather than being locked into a SaaS vendor. As agent complexity grows, these platforms are increasingly where initial designs get validated before being re-implemented in code.