1.langfuse / langfuse
🪢 Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.
+375 stars
from 36,469 · score 5.93
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2.openobserve / openobserve
Open source observability platform for logs, metrics, traces, RUM (web, android, ios), Session replay, pipelines, SLO and LLM observability. A sophisticated, simple and highly performant alternative to Datadog, Splunk, and Elasticsearch with 140x lower storage costs and single binary deployment.
+168 stars
from 22,487 · score 5.13
3.Effect-TS / effect
Build production-ready applications in TypeScript
+72 stars
from 17,384 · score 4.29
4.SigNoz / signoz
SigNoz is an open-source, OpenTelemetry-native observability platform for your team and their AI agents. Get logs, metrics, and traces in one tool with features like APM, distributed tracing, log management, infra monitoring, etc. Combined with SigNoz MCP and a native AI teammate (in SigNoz Cloud) it helps you build more resilient apps.
+48 stars
from 32,447 · score 3.89
5.VoltAgent / voltagent
AI Agent Engineering Platform built on an Open Source TypeScript AI Agent Framework
+41 stars
from 10,868 · score 3.74
6.elastic / kibana
Your window into all of your data
+14 stars
from 21,339 · score 2.71
7.langwatch / langwatch
Open-Source Agent Observability & Evals for AI Platform teams. Trace, test, route and govern every agent & coding assistant in the company.
+12 stars
from 4,991 · score 2.56