Agenta-AI/agenta: Open-Source LLMOps Platform — Playground, Evaluation, Observability in One Stack at 4K Stars

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Agenta is an open-source LLMOps platform combining prompt playground, prompt management, LLM evaluation (including LLM-as-a-judge), and observability. Built in TypeScript with a focus on the full prompt engineering lifecycle. For builders running LLM-powered features in production, Agenta replaces the patchwork of separate tools (Langfuse + PromptLayer + custom eval scripts) with a single self-hostable platform covering the entire prompt-to-production pipeline.