1.langfuse / langfuse🪢 Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.analyticsllmllmopslarge-language-modelsopenaiself-hosted+13 moreTypeScriptOther license37K total4.2K forks+343 starsfrom 36,724 · score 5.84
2.Arize-ai / phoenixAI Observability & Evaluationllmopsai-monitoringai-observabilityllm-evalaiengineeringdatasets+10 morePythonOther license12K total1.3K forks+99 starsfrom 12,066 · score 4.61