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1Arize-ai / phoenixAI Observability & EvaluationPythonNOASSERTION · Restricted / unknownInsufficient rank history12,1031,258——2026-11-02

2latitude-dev / latitude-llmOpen-source observability for AI agents. Find where your agents fail, dispatch your coding agent to fix it, and verify the fix against real traces.TypeScriptMIT · PermissiveInsufficient rank history4,743407——2026-11-02

3pydantic / logfireAI observability platform for production LLM and agent systems.PythonMIT · PermissiveInsufficient rank history4,530351——2026-11-03

4truera / trulensEvaluation and Tracking for LLM Experiments and AI AgentsPythonMIT · PermissiveInsufficient rank history3,626384——2026-11-03

5lmnr-ai / lmnrLaminar - open-source observability platform purpose-built for AI agents. YC S24.TypeScriptApache-2.0 · PermissiveInsufficient rank history3,472258——2026-11-02

6future-agi / future-agiOpen-source, end-to-end platform for evaluating, observing, and improving LLM and AI agent applications. Tracing · Evals · Simulations · Datasets · Gateway · Guardrails. Self-hostable. Apache 2.0.PythonApache-2.0 · PermissiveInsufficient rank history2,241704——2026-11-03

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