1.langfuse / langfuse
🪢 Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.
+4,527 stars
from 32,317 · score 8.42
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Ranked by Attention Score: stars gained over the last 90 complete days
10 repositories by Attention Score · Aug 5, 2026 – Nov 2, 2026 (UTC)
2.Effect-TS / effect
Build production-ready applications in TypeScript
+2,368 stars
from 15,088 · score 7.77
3.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.
+2,174 stars
from 20,481 · score 7.68
4.langwatch / langwatch
Open-Source Agent Observability & Evals for AI Platform teams. Trace, test, route and govern every agent & coding assistant in the company.
+1,548 stars
from 3,455 · score 7.35
5.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.
+1,005 stars
from 31,490 · score 6.91
6.VoltAgent / voltagent
AI Agent Engineering Platform built on an Open Source TypeScript AI Agent Framework
+699 stars
from 10,210 · score 6.55
7.elastic / kibana
Your window into all of your data
+177 stars
from 21,176 · score 5.18
8.deepfence / ThreatMapper
Open Source Cloud Native Application Protection Platform (CNAPP)
+27 stars
from 5,300 · score 3.33
9.mishanefedov / agentwatch
Local-only observability for AI agents on your machine. One timeline across coding and non-coding agents.
+2 stars
from 15 · score 1.10
10.eosrio / hyperion-history-api
Scalable Full History API Solution for Antelope (former EOSIO) based blockchains
+1 stars
from 135 · score 0.69