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 total4.1K forks+4,527 starsfrom 32,317 · score 8.42
2.VoltAgent / voltagentAI Agent Engineering Platform built on an Open Source TypeScript AI Agent Frameworkagentsaichatbotsllmmcpnodejs+14 moreTypeScriptMIT11K total1.2K forks+699 starsfrom 10,210 · score 6.55
3.mnfst / llm-gatewayOpen Source LLM Gateway 🦚openclawcost-trackingllm-observabilitytoken-trackingllm-routerhermes-agent+9 moreTypeScriptMIT7.6K total524 forks+286 starsfrom 7,326 · score 5.66
4.latitude-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.llm-observabilityagent-monitoringagent-observabilityai-error-monitorai-monitoringai-observability+2 moreTypeScriptMIT4.7K total407 forks+207 starsfrom 4,535 · score 5.34